01 - Preheat oven to 325°F. Line two baking sheets with parchment paper.
02 - Whisk together the all-purpose flour, almond flour, baking powder, and salt in a medium bowl until evenly blended.
03 - Beat the softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
04 - Add the egg, almond extract, and vanilla extract to the butter mixture. Beat until thoroughly combined.
05 - Gradually incorporate the dry ingredients into the wet mixture, mixing just until a soft dough forms.
06 - Scoop tablespoon-sized portions of dough and roll into balls. Arrange 2 inches apart on prepared baking sheets.
07 - Flatten each dough ball slightly and press one whole blanched almond into the center of each cookie.
08 - Whisk the reserved egg yolk with 1 tablespoon milk. Brush the tops of the cookies with the egg wash mixture.
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.