Make the Chocolate Thumbprint Cookies Recipe: tender chocolate cookies filled with silky ganache. Bake, fill, and chill for perfect treats.
Whisk the all-purpose flour, Dutch-process cocoa powder, salt and baking powder together in a medium bowl until the mixture looks even and uniform; this is the quiet foundation for the cookies so you want no streaks of cocoa or flour. Use a gentle circular whisking motion so the powders bloom and lighten in color, and scrape the sides with a spatula once so everything sits flush and ready to meet the butter later.
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In a large, matte grey ceramic mixing bowl, beat the softened unsalted butter with the light brown sugar and granulated sugar until the mixture becomes pale, glossy and fluffy—about two minutes on medium speed. You should be able to see tiny air bubbles and ribbon-like folds when the paddle is lifted; that aeration is what yields tender cookies.
Beat in the egg yolks and vanilla bean paste until the wet mixture lightens and gains a slightly satin sheen, another minute or two. The texture changes from pillowy butter to a silkier, more cohesive batter that will cling to the dry ingredients without becoming greasy.
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Fold the whisked dry ingredients into the butter mixture using a flexible spatula, mixing just until there are no visible streaks of flour and the dough comes together into a soft, dark chocolate mass; stop while it’s still slightly pliable to avoid toughness. The dough should be cohesive, barely tacky and thick enough to roll into balls without sticking to your hands.
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Scoop the dough into level tablespoon portions and roll each into a smooth, round ball. Work cleanly and place the rounds on a parchment-lined baking sheet with even spacing so they will bake uniformly. The surface of each ball should be smooth with a faint sheen from the butter.
Press a small, neat 1/4 teaspoon-sized indent into the center of every dough ball to form the thumbprint wells, then transfer the entire tray to the refrigerator to chill for at least an hour. Chilling firms the butter and preserves the round domed edges so the cookies bake with soft centers and defined rims.
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Arrange the chilled sheet about 1½ inches apart and bake at 350°F for roughly 9–11 minutes until the edges are set but the centers remain soft. They will puff slightly and the surface will take on a matte, slightly coarse baked texture—deep chocolate color with a tender interior.
While the cookies are still warm and just out of the oven, re-press the centers with the 1/4 teaspoon if any wells have puffed back up; you can gently tidy edges with a small circular cutter. Let the cookies cool on the baking sheet for five minutes to set before transferring to a wire rack to finish cooling.
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Place semi-sweet chocolate chips into a small heatproof bowl and warm the heavy cream until it’s just steaming; pour the cream over the chocolate, let it sit for a minute, then stir into a glossy, velvety ganache. Spoon about one teaspoon of the warm ganache into each thumbprint well, finishing any festive cookies with a ring of red, green and white nonpareil sprinkles. Chill the assembled tray briefly so the ganache firms to a satiny finish.
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