Sift or whisk together the flour, cocoa, almond flour, baking powder, and salt into a small bowl and set aside.
1½ cup (188 grams) all purpose flour, ½ cup (48 grams) unsweetened cocoa powder, ¼ cup (26 grams) almond flour, 1 teaspoon baking powder, ½ teaspoon salt
In a mixing bowl or the bowl of your stand mixer, cream together the softened butter, brown sugar, and granulated sugar until well combined.
16 tablespoons (1½ sticks or 170 grams) unsalted butter, ¾ cup (144 grams) dark brown sugar, ¼ cup (50 grams) granulated sugar
Scrape down the bowl with a spatula, then beat in the egg and Frangelico for one minute.
1 large egg, 1 tablespoon Frangelico or other hazelnut liqueur
Stir in the dry ingredients or mix on low until just incorporated.
Line two cookie sheets with parchment or silicone mats, and use a #40 cookie scoop or two spoons to scoop 1½ tablespoon sized balls of cookie dough, leaving two inches between the balls.
Use your thumb or the round base of a wooden spoon or spatula to make a thumbprint in the center of each cookie ball, making sure not to go all the way through. Wet your thumb slightly if the chocolate cookie dough sticks.
Chill the sheets of cookie dough in the freezer for at least 30 to 60 minutes to minimize the thumbprint cookies from spreading. When ready to bake, heat the oven to 375℉.
Bake the chocolate thumbprints for 10 to 12 minutes, one sheet at a time, rotating the cookie sheets around if you need to about halfway. They should be just slightly firm to touch. When done, immediately remove the pan from the oven and use the back of a spoon to press down the thumbprint again. Let cool.