In the bowl of a mixer beat butter with sugars.
Add the egg and almond flavor and mix on low until combined.
On medium-low mix in the flour, baking soda, cornstarch, and salt.
on low-speed mix 3/4 cup almonds.
Scoop out 2 tablespoons dough onto parchment lined baking sheets 2 inches apart.
Place 4 sliced almonds on top of each cookie.
Bake cookies at 350° for 10-12 minutes.
Remove cookies from oven when centers are blonde, edges are golden they will be slightly raised and will flatten and crackle as they cool on the baking sheets.