Preheat oven to 350F. Line a large baking sheet with parchment paper.
In a stand mixer, cream together almond paste, granulated sugar, and powdered sugar until combined. On the slowest setting add flour, salt, almond extract, and egg whites. Combine until just mixed together.
Use an ice cream scoop to scoop out dough. Roll into a ball with your hands and roll in sliced almonds, then place on baking sheet. Repeat for the rest of the dough.
Bake for 15-20 minutes, or until cookies are starting to turn golden brown towards the bottom half of the cookie. Cool before serving.
Click on the time in the instructions to start a timer!