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 until fully incorporated.
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 combined.
05 - Gradually incorporate dry ingredients into wet mixture, mixing just until soft dough forms.
06 - Scoop tablespoon-sized portions, roll into balls, and arrange 2 inches apart on prepared baking sheets.
07 - Flatten each dough ball slightly and press one blanched almond into the center of each cookie.
08 - Combine reserved egg yolk with milk and brush mixture over cookie tops.
09 - Bake for 16-18 minutes until edges are lightly golden.
10 - Let cookies rest on baking sheets for 5 minutes, then transfer to wire rack to cool completely.