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 evenly blended.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
04 - Mix in egg, almond extract, and vanilla extract to the butter mixture until fully incorporated. Reserve half the egg yolk for later use.
05 - Gradually fold dry ingredients into wet mixture, stirring just until a soft, cohesive dough forms.
06 - Scoop tablespoon-sized portions and roll into balls. 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 1 tablespoon milk. Brush mixture lightly over the tops of cookies.
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.