01 - Preheat oven to 325°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the all-purpose flour, almond flour, baking powder, and salt until well blended.
03 - In a large bowl, beat the softened butter and granulated sugar with an electric mixer until light and fluffy, approximately 2-3 minutes.
04 - Add the egg, reserving half the yolk for the egg wash, along with the almond extract and vanilla extract. Beat until fully incorporated.
05 - Gradually add the dry ingredients to the wet mixture, mixing on low speed just until a soft dough forms. Be careful not to overmix.
06 - Scoop tablespoon-sized portions of dough and roll into balls. Arrange them 2 inches apart on the prepared baking sheets.
07 - Gently flatten each dough ball and press one whole blanched almond into the center of each cookie.
08 - In a small bowl, whisk the reserved egg yolk with 1 tablespoon of milk until combined. Brush the tops of the cookies with the egg wash mixture.
09 - Bake for 16-18 minutes, or until the edges are lightly golden brown.
10 - Let the cookies rest on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely before storing or serving.