Preheat oven to 325°F. Line a sheet pan with parchment.
Cream softened butter and sifted powdered sugar until smooth and pale.
Mix in almond extract.
Add both flours and salt. Mix until a soft dough forms.
Scoop into 1-inch balls, place 2 inches apart on the pan, and flatten to 1/3-inch with the bottom of a glass.
Press sliced almonds on top if using.
Bake 13–15 minutes until edges are barely golden. Cool completely on the pan before moving.
Almond shortbread cookies are perfect for gifting, stacking, or sandwiching with raspberry jam for a fancier finish.