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. Reserve half the egg yolk for the wash. Beat until fully incorporated.
05 - Gradually fold dry ingredients into the wet mixture, mixing just until a soft dough comes together. Avoid overmixing.
06 - Scoop tablespoon-sized portions, roll into balls, and arrange 2 inches apart on prepared baking sheets. Flatten each ball slightly and press a blanched almond into the center.
07 - Whisk reserved egg yolk with milk. Brush the tops of each cookie with the mixture.
08 - Bake for 16-18 minutes until edges are lightly golden.
09 - Let cookies rest on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.