Bakery-Style Rainbow Sprinkle Layer Cake

A buttery vanilla aroma, confetti-studded crumb, and thick swirls of creamy frosting make this rainbow sprinkle layer cake recipe feel properly celebratory before the first slice is even plated. The layers are soft but sturdy, with colorful jimmies suspended throughout instead of collecting at the bottom. A snowy vanilla buttercream provides enough structure for clean layers while keeping the finish playful rather than fussy.

I use reverse creaming here because coating the cake flour with butter and oil limits excess gluten development, producing a fine crumb that remains strong enough to stack. Room-temperature ingredients help the batter emulsify smoothly, and weighing the batter between three 8-inch pans keeps the layers level. The cakes are ready when their centers spring back, the edges begin pulling from the pans, and a tester shows moist crumbs without wet batter.

Why You’ll Love this Cake

• Reverse creaming coats the cake flour with fat before the liquids are added, limiting gluten formation and creating a fine, even crumb that slices cleanly.
• A combination of butter and neutral oil provides buttery flavor while helping the layers remain soft after cooling and refrigeration.
• Whole eggs contribute emulsifiers and structure, while additional egg whites support the cake without adding enough yolk to mute the rainbow colors.
• Buttermilk supplies moisture and gentle acidity, which works with the baking soda to improve lift, tenderness, and balanced browning.
• Rainbow jimmies are folded in at the end so they remain distinct, while a firm crumb coat and chilled assembly keep the three layers aligned.

Ingredient Notes for Bakery-Style Rainbow Sprinkle Layer Cake

• Cake flour: Its lower protein content reduces gluten development and gives the cake a finer crumb. Fluff, spoon, and level if measuring by volume, although weighing is more reliable for this formula.
• Unsalted butter and neutral oil: Butter provides flavor and structure, while oil remains fluid when cool and helps prevent a dry refrigerator-cold crumb. The cake butter must be pliable but not greasy.
• Eggs and egg whites: Whole eggs provide fat and emulsifiers; extra whites reinforce the structure and keep the crumb relatively pale. Bring both to room temperature so they incorporate without breaking the emulsion.
• Buttermilk: Full-fat buttermilk adds moisture, mild tang, and acidity for the baking soda. Shake it before measuring because its milk solids can settle.
• Rainbow jimmies: Long, rod-shaped sprinkles hold their color better in batter than tiny nonpareils, which tend to bleed. Fold them gently and stop as soon as they are distributed.
• Confectioners’ sugar: Finely milled sugar thickens and sweetens the buttercream. Sifting removes hard lumps that would otherwise leave streaks or clog a piping tip.
• Heavy cream: A small amount loosens the frosting and helps it whip smoothly. Add it gradually because overly soft buttercream can cause the stacked layers to shift.

My Baking Tips

• Use light-colored aluminum pans rather than dark nonstick pans. Dark surfaces absorb more heat and can set the crust before the center has finished rising.
• Weigh the finished batter as you divide it. Equal portions produce layers that finish baking together and require less trimming before assembly.
• Stop folding as soon as the jimmies are dispersed. Overworking the batter encourages color bleeding and develops more gluten after the liquids have hydrated the flour.
• Check the buttercream before stacking by dragging a spatula through it. The ridge should remain defined; if it slumps, chill the frosting for 10 minutes and mix briefly on low.
• Chill only the crumb-coated cake, not every frosting layer. Excessive chilling can make the outer buttercream difficult to smooth and may encourage condensation in a humid kitchen.

Ingredients for Rainbow Sprinkle Layer Cake

• 390 g cake flour (about 3 1/4 cups, properly measured)
• 450 g granulated sugar (about 2 1/4 cups)
• 14 g baking powder (1 tablespoon plus 1/2 teaspoon)
• 2 g baking soda (1/2 teaspoon)
• 6 g fine sea salt (1 teaspoon)
• 225 g unsalted butter (1 cup, softened to 68°F to 70°F and cut into tablespoons)
• 75 g neutral vegetable oil (1/3 cup, such as canola or grapeseed oil)
• 300 g full-fat buttermilk (1 1/4 cups, room temperature)
• 150 g large eggs (3 large eggs without shells, room temperature)
• 90 g large egg whites (from about 3 large eggs, room temperature)
• 15 g pure vanilla extract (1 tablespoon)
• 120 g rainbow jimmies (about 3/4 cup, for the cake batter)
• 565 g unsalted butter (2 1/2 cups, softened to 68°F to 70°F, for the buttercream)
• 750 g confectioners’ sugar (about 6 cups, sifted)
• 60 g heavy cream (1/4 cup, room temperature)
• 10 g pure vanilla extract (2 teaspoons, for the buttercream)
• 3 g fine sea salt (1/2 teaspoon, for the buttercream)
• 90 g rainbow jimmies (about 1/2 cup, for decorating)

How to Make Rainbow Sprinkle Layer Cake

• STEP 1). Prepare the oven and cake pans Set an oven rack in the center and preheat the oven to 350°F. Lightly grease three light-colored 8-inch round cake pans, line the bottoms with parchment rounds, and grease the parchment. Do not heavily grease the sides because the batter needs slight resistance as it rises. Confirm that the butter, eggs, egg whites, and buttermilk are near room temperature. This promotes a stable emulsion and helps the three pans bake at the same rate.
• STEP 2). Reverse cream the dry ingredients and fats Place the cake flour, granulated sugar, baking powder, baking soda, and salt in the bowl of a stand mixer fitted with the paddle. Mix on low for 30 seconds to distribute the leaveners. Add the softened cake butter and oil, then mix on low until the flour is moistened. Increase to medium-low for 90 seconds. The mixture should resemble damp sand, with small clumps that hold together when pressed, but no large pieces of butter.
• STEP 3). Add the liquid ingredients in stages Whisk the buttermilk, whole eggs, egg whites, and vanilla in a jug until smooth. With the mixer on low, pour half into the flour mixture and mix until incorporated. Scrape the bowl and paddle, then beat on medium for 60 seconds to develop enough structure. Add the remaining liquid in two portions, mixing on low for 20 seconds after each. Scrape thoroughly. The finished batter should be thick, smooth, and cohesive, with no oily streaks or dry pockets.
• STEP 4). Fold in the sprinkles and divide the batter Remove the bowl from the mixer and add the 120 g rainbow jimmies. Fold with a flexible spatula only until the colors are evenly dispersed, using broad strokes that reach the bottom of the bowl. Prolonged mixing can dissolve the candy coating and streak the batter. Divide approximately 610 g of batter into each prepared pan and smooth the surfaces. Tap each pan once against a folded towel to settle large air pockets without knocking out the useful fine bubbles.
• STEP 5). Bake the cake layers Bake all three pans on the center rack for 24 to 29 minutes, leaving space between them for air circulation. Rotate the pans front to back after 20 minutes if the oven browns unevenly, but avoid opening the door earlier. The layers are done when the tops spring back under a light touch, the edges just pull from the pans, and a tester returns with moist crumbs but no wet batter. An instant-read thermometer should register about 205°F to 210°F at the center.
• STEP 6). Cool and release the layers Transfer the pans to wire racks and cool for 15 minutes. Run a thin offset spatula around each edge, invert the cakes onto the racks, and remove the parchment. Turn them upright and cool completely for about 75 minutes before trimming or frosting. Warm layers will melt buttercream and slide during stacking. For cleaner handling, wrap the fully cooled layers individually and refrigerate them for 30 minutes; they should feel cool and firm, not frozen.
• STEP 7). Whip the vanilla buttercream Place the 565 g softened butter in a clean stand mixer bowl fitted with the paddle. Beat on medium for 3 minutes, scraping once, until smooth and visibly lighter. Add the sifted confectioners’ sugar in four additions on low speed, alternating the final two additions with the cream. Add the vanilla and salt, then beat on medium-low for 2 minutes. Finish on low for 1 minute to reduce air pockets. The frosting should hold a soft peak and spread without tearing the cake.
• STEP 8). Level, fill, and crumb coat the cake If necessary, use a serrated knife to remove only the domed tops from the chilled layers. Place one layer cut side up on a cake board set on a turntable. Spread about 170 g buttercream evenly to the edge, add the second layer, and repeat. Position the final layer cut side down. Apply a thin crumb coat over the top and sides with an offset spatula, then smooth it with a bench scraper. Refrigerate the cake uncovered for 30 minutes, until the coating feels firm.
• STEP 9). Finish, decorate, and slice the cake Reserve about 200 g buttercream for piping, then cover the chilled cake with the remaining frosting. Smooth the sides with a bench scraper while rotating the turntable, filling gaps as needed. Press most of the 90 g rainbow jimmies around the lower third, catching the excess on a tray. Pipe buttercream swirls around the top edge and add the remaining sprinkles. Let the finished cake stand for 30 minutes before serving, then cut with a warm, dry knife, wiping it between slices.

Storage and Freezing

• Room temperature: Keep the covered cake in a cool room for up to 1 day, away from direct sunlight and heat.
• Refrigeration: Store the cake in a covered cake container for up to 5 days. Cover cut surfaces with parchment or plastic wrap to limit moisture loss.
• Freezing: Freeze unfrosted layers, wrapped twice, for up to 2 months. The assembled cake may be frozen uncovered until firm, then wrapped securely, for up to 1 month.
• Thawing: Thaw wrapped cake layers overnight in the refrigerator.
• Thaw an assembled cake in its wrapping in the refrigerator, then uncover it after condensation has settled.
• Serving: Bring refrigerated slices to room temperature for 30 to 45 minutes so the buttercream softens and the crumb regains its tender texture.

Frequently Asked Questions

More Ridiculously Delicious Cakes

• Carrot Layer Cake with a Moist Crumb
• Lemon Layer Cake with Soft, Bright Citrus Layers
• Black Forest Layer Cake with Soft, Tender Crumb
• Coconut Layer Cake with Soft, Tender Crumb
• Moist Chocolate Fudge Layer Cake with Silky Fudge Frosting

Bakery-Style Rainbow Sprinkle Layer Cake

A three-layer 8-inch vanilla celebration cake with a tender reverse-creamed crumb, rainbow jimmies, smooth vanilla buttercream, and a crisp sprinkle finish.

Print Recipe Pin Recipe

Prep Time 50 minutes mins

Cook Time 29 minutes mins

Cooling 2 hours hrs 30 minutes mins

Total Time 4 hours hrs

Servings: 16 slices

Course: Dessert

Cuisine: American

Calories: 868

Ingredients Equipment Method Notes

Ingredients

  

• 390 g cake flour about 3 1/4 cups, properly measured
• 450 g granulated sugar about 2 1/4 cups
• 14 g baking powder 1 tablespoon plus 1/2 teaspoon
• 2 g baking soda 1/2 teaspoon
• 6 g fine sea salt 1 teaspoon
• 225 g unsalted butter 1 cup, softened to 68°F to 70°F and cut into tablespoons
• 75 g neutral vegetable oil 1/3 cup, such as canola or grapeseed oil
• 300 g full-fat buttermilk 1 1/4 cups, room temperature
• 150 g large eggs 3 large eggs without shells, room temperature
• 90 g large egg whites from about 3 large eggs, room temperature
• 15 g pure vanilla extract 1 tablespoon
• 120 g rainbow jimmies about 3/4 cup, for the cake batter
• 565 g unsalted butter 2 1/2 cups, softened to 68°F to 70°F, for the buttercream
• 750 g confectioners’ sugar about 6 cups, sifted
• 60 g heavy cream 1/4 cup, room temperature
• 10 g pure vanilla extract 2 teaspoons, for the buttercream
• 3 g fine sea salt 1/2 teaspoon, for the buttercream
• 90 g rainbow jimmies about 1/2 cup, for decorating

Equipment

• Three light-colored 8-inch round cake pans, each about 2 inches deep
• Parchment paper rounds
• Digital kitchen scale and measuring spoons
• Stand mixer fitted with a paddle attachment
• Large mixing bowl and medium liquid measuring jug
• Flexible silicone spatula
• Fine-mesh sieve
• Instant-read thermometer or wooden cake tester
• Wire cooling racks
• Offset spatulas, one small and one large
• Cake turntable and bench scraper
• Serrated knife or cake leveler
• Piping bag fitted with a large open-star tip

Method

 

1. Set an oven rack in the center and preheat the oven to 350°F. Lightly grease three light-colored 8-inch round cake pans, line the bottoms with parchment rounds, and grease the parchment. Do not heavily grease the sides because the batter needs slight resistance as it rises. Confirm that the butter, eggs, egg whites, and buttermilk are near room temperature. This promotes a stable emulsion and helps the three pans bake at the same rate.
2. Place the cake flour, granulated sugar, baking powder, baking soda, and salt in the bowl of a stand mixer fitted with the paddle. Mix on low for 30 seconds to distribute the leaveners. Add the softened cake butter and oil, then mix on low until the flour is moistened. Increase to medium-low for 90 seconds. The mixture should resemble damp sand, with small clumps that hold together when pressed, but no large pieces of butter.
3. Whisk the buttermilk, whole eggs, egg whites, and vanilla in a jug until smooth. With the mixer on low, pour half into the flour mixture and mix until incorporated. Scrape the bowl and paddle, then beat on medium for 60 seconds to develop enough structure. Add the remaining liquid in two portions, mixing on low for 20 seconds after each. Scrape thoroughly. The finished batter should be thick, smooth, and cohesive, with no oily streaks or dry pockets.
4. Remove the bowl from the mixer and add the 120 g rainbow jimmies. Fold with a flexible spatula only until the colors are evenly dispersed, using broad strokes that reach the bottom of the bowl. Prolonged mixing can dissolve the candy coating and streak the batter. Divide approximately 610 g of batter into each prepared pan and smooth the surfaces. Tap each pan once against a folded towel to settle large air pockets without knocking out the useful fine bubbles.
5. Bake all three pans on the center rack for 24 to 29 minutes, leaving space between them for air circulation. Rotate the pans front to back after 20 minutes if the oven browns unevenly, but avoid opening the door earlier. The layers are done when the tops spring back under a light touch, the edges just pull from the pans, and a tester returns with moist crumbs but no wet batter. An instant-read thermometer should register about 205°F to 210°F at the center.
6. Transfer the pans to wire racks and cool for 15 minutes. Run a thin offset spatula around each edge, invert the cakes onto the racks, and remove the parchment. Turn them upright and cool completely for about 75 minutes before trimming or frosting. Warm layers will melt buttercream and slide during stacking. For cleaner handling, wrap the fully cooled layers individually and refrigerate them for 30 minutes; they should feel cool and firm, not frozen.
7. Place the 565 g softened butter in a clean stand mixer bowl fitted with the paddle. Beat on medium for 3 minutes, scraping once, until smooth and visibly lighter. Add the sifted confectioners’ sugar in four additions on low speed, alternating the final two additions with the cream. Add the vanilla and salt, then beat on medium-low for 2 minutes. Finish on low for 1 minute to reduce air pockets. The frosting should hold a soft peak and spread without tearing the cake.
8. If necessary, use a serrated knife to remove only the domed tops from the chilled layers. Place one layer cut side up on a cake board set on a turntable. Spread about 170 g buttercream evenly to the edge, add the second layer, and repeat. Position the final layer cut side down. Apply a thin crumb coat over the top and sides with an offset spatula, then smooth it with a bench scraper. Refrigerate the cake uncovered for 30 minutes, until the coating feels firm.
9. Reserve about 200 g buttercream for piping, then cover the chilled cake with the remaining frosting. Smooth the sides with a bench scraper while rotating the turntable, filling gaps as needed. Press most of the 90 g rainbow jimmies around the lower third, catching the excess on a tray. Pipe buttercream swirls around the top edge and add the remaining sprinkles. Let the finished cake stand for 30 minutes before serving, then cut with a warm, dry knife, wiping it between slices.

Notes

• Use light-colored aluminum pans rather than dark nonstick pans. Dark surfaces absorb more heat and can set the crust before the center has finished rising.
• Weigh the finished batter as you divide it. Equal portions produce layers that finish baking together and require less trimming before assembly.
• Stop folding as soon as the jimmies are dispersed. Overworking the batter encourages color bleeding and develops more gluten after the liquids have hydrated the flour.
• Check the buttercream before stacking by dragging a spatula through it. The ridge should remain defined; if it slumps, chill the frosting for 10 minutes and mix briefly on low.
• Chill only the crumb-coated cake, not every frosting layer. Excessive chilling can make the outer buttercream difficult to smooth and may encourage condensation in a humid kitchen.