Preheat oven to 350 degrees, and line a baking sheet with Silpat or parchment paper.
Beat egg whites until stiff peaks form. Set aside.
In stand mixer, beat almond paste with granulated sugar and powdered sugar until the texture is sandy.
Add flour, salt, and almond extract and mix. Then add beaten egg whites, and mix on low speed until a dough forms. May need a high speed few seconds. Dough will be very soft.
Scoop dough into rounded tablespoon-sized balls, and roll in sliced almonds*. Place on lined baking sheet, and bake at 350 degrees for 20 minutes, or until the edges are golden. *minus a roll in almonds, these cookies are beautiful almond macarons.
