01 - Preheat oven to 325°F. Line two baking sheets with parchment paper.
02 - Whisk together all-purpose flour, almond flour, baking powder, and salt in a medium bowl.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
04 - Mix in egg (reserving half the yolk), almond extract, and vanilla extract until fully incorporated.
05 - Gradually blend dry ingredients into wet mixture, mixing just until soft dough forms.
06 - Roll tablespoon-sized portions into balls. Arrange 2 inches apart on prepared baking sheets.
07 - Flatten dough balls slightly. Press one whole almond into center of each cookie.
08 - Whisk reserved egg yolk with 1 tablespoon milk. Brush tops of cookies with mixture.
09 - Bake for 16-18 minutes until edges are lightly golden.
10 - Let cookies rest on baking sheets for 5 minutes. Transfer to wire rack to finish cooling.