Go Back
Blackberry thumbprint cookies with golden edges and glossy tart blackberry jam centers on a ceramic platter

Blackberry Thumbprint Cookies with Tart Berry Jam

Buttery blackberry thumbprint cookies with tender centers, lightly golden edges, and precisely portioned tart blackberry preserves that set without spilling over.
Print Recipe Pin Recipe
Prep Time 30 minutes
Cook Time 30 minutes
Cooling 1 hour 15 minutes
Total Time 2 hours 15 minutes
Servings: 24 cookies
Course: Dessert
Cuisine: American
Calories: 122
Ingredients Equipment Method Notes

Ingredients
  

  • 170 g unsalted butter 3/4 cup; softened to 18 to 20°C
  • 100 g granulated sugar 1/2 cup
  • 1 large egg yolk at room temperature
  • 1 tsp pure vanilla extract 5 ml
  • 240 g all-purpose flour 2 cups, measured by weight
  • 20 g cornstarch 2 tablespoons plus 2 teaspoons
  • 2 g fine sea salt 1/3 teaspoon
  • 120 g thick blackberry preserves about 1/3 cup plus 2 tablespoons; stir until smooth but do not warm

Equipment

  • Digital kitchen scale
  • Two light-colored rimmed baking sheets
  • Parchment paper
  • Stand mixer with paddle attachment or electric hand mixer
  • Medium mixing bowl
  • Fine-mesh sieve or whisk
  • Flexible silicone spatula
  • Small cookie scoop
  • Rounded 1/2-teaspoon measure or 2 cm-wide utensil handle
  • Level teaspoon measure
  • Wire cooling rack

Method
 

  1. Line two light-colored rimmed baking sheets with parchment paper. In a medium bowl, whisk the all-purpose flour, cornstarch, and salt for 30 seconds, breaking up every visible lump. Set the mixture beside the mixer. Stir the blackberry preserves until evenly smooth, then keep them at room temperature without heating. Properly mixed dry ingredients prevent cornstarch pockets, while cool, thick preserves are less likely to soak into the dough or boil over during baking.
  2. Place the softened butter and granulated sugar in the bowl of a stand mixer fitted with the paddle attachment. Mix on medium-low speed for 2 minutes, stopping once to scrape the bowl and paddle. The mixture should look smooth, creamy, and slightly lighter, but not fluffy or warm. Add the egg yolk and vanilla, then mix on low for 30 to 45 seconds until fully emulsified. Scrape the bowl again; no streaks of yolk should remain.
  3. Add the flour mixture to the butter mixture in two additions, mixing on the lowest speed for about 15 seconds after each. Stop when only a few dry streaks remain, then fold with a flexible spatula until the dough forms soft, cohesive clumps. It should hold together when pressed without feeling sticky or greasy. Cover the bowl and refrigerate the dough for 30 minutes, until it feels cool and firm enough to portion but remains pliable when rolled.
  4. Divide the chilled dough into 24 portions of 22 grams each. Roll every portion between your palms just until smooth, then arrange 12 balls on each prepared baking sheet with about 5 cm between them. Using a rounded 1/2-teaspoon measure or a 2 cm-wide utensil handle, press gradually into the center of each ball, stopping about 6 mm above the bottom. Widen the well to roughly 2 cm. Gently pinch closed any prominent rim cracks while the dough is still pliable.
  5. Refrigerate both trays of shaped cookies for 20 minutes. Meanwhile, position a rack in the center of the oven and preheat to 175°C. If the wells have risen during chilling, redefine them gently without pressing through the base. Spoon one level teaspoon, about 5 grams, of blackberry preserves into each cavity, keeping the filling level rather than mounded. Bake one sheet at a time for 14 to 16 minutes, until the tops are matte and the narrow edges are light golden.
  6. Set the hot baking sheet on a heat-safe surface and leave the cookies undisturbed for 10 minutes. The preserves may bubble gently at the edges when the tray leaves the oven, but they will thicken as they cool. Use a thin spatula to transfer the cookies to a wire rack, keeping them level so the warm centers do not shift. Cool for at least 35 additional minutes before serving or storing; the bases should feel firm and the jam should no longer flow.

Notes

  • Measure each dough portion at 22 grams. Uneven portions bake at different rates, and larger cookies require deeper wells that are more likely to hold underbaked dough beneath the preserves.
  • If the dough splits into wide cracks when pressed, let that portion stand at room temperature for 2 to 3 minutes. A slightly pliable surface compresses more cleanly than very cold, rigid dough.
  • Keep the indentation about 6 mm above the cookie base. Pressing too deeply creates a thin floor that can leak preserves or stick to the parchment after baking.
  • Use cool, thick preserves and level each teaspoon. A rounded spoonful forms a high central mound that can boil over before the cookie edges are fully baked.
  • Bake one tray at a time on the center rack. This gives the butter-rich dough even heat and makes the pale-top, golden-edge doneness cues easier to judge.