1¾ cups (219 grams) all-purpose flour6 tablespoons (30 grams) Dutch process cocoa powder1½ teaspoons (7.5 grams) baking powder1 teaspoon (3 grams) kosher salt¼ teaspoon (1.25 grams) baking soda1 large egg (50 grams), cold2 large egg yolks (37 grams), cold1 teaspoon (4 grams) vanilla extract½ cup (113 grams) cold unsalted butter, cubed½ cup (110 grams) firmly packed light brown sugar6 tablespoons (72 grams) granulated sugar8 ounces (227 grams) thin crème de menthe chocolate mints, plus more for topping
In a medium bowl, whisk together flour, cocoa, baking powder, salt, and baking soda.
In a small bowl, whisk together cold egg, cold egg yolks, and vanilla.
In the bowl of a stand mixer fitted with the paddle attachment, beat cold butter and sugars at medium speed until well combined, about 1 minute, stopping to scrape sides of bowl. With mixer on low speed, gradually add flour mixture alternately with egg mixture, beginning and ending with flour mixture, beating just until combined after each addition. Beat in chocolate mints, letting mixer break them into different sizes, 30 seconds to 1 minute.
Using a ½-cup dry-measuring cup, scoop dough (about 140 grams each), and place 2 inches apart on prepared pan. Press a 3-tablespoon spring-loaded scoop, rounded side up, into middle of each dough scoop to create a mounded center with a border. Cover and refrigerate for at least 2 hours or overnight.
Preheat oven to 375°F (190°C). Line a large baking sheet with parchment paper.
Place dough 3 inches apart on prepared pan.
Bake until edges are set and tops look matte, 15 to 17 minutes, rotating pan halfway through baking. Top with broken chocolate mints. While cookies are still hot, gently swirl a 4- to 5-inch round cutter in a circular motion around each cookie to create an even round. Let cool on pan for 5 minutes. Remove from pan, and let cool completely on a wire rack. Store in an airtight container for up 3 days.