Cream butter and sugar in a mixing bowl. Add egg and extract. Combine flour, salt, baking powder, and cream of tartar to the cream mixture. Stir in the chopped almonds. Cover and refrigerate while you make the filling
Combine the melted chocolate melts and almond extract until blended
Take dough from refrigerator and form into small 1 inch balls. Place on parchment lined cookie sheets 2 inches apart. Use a teaspoon to make indentation in center of each cookie.
Spoon 1 teaspoon of filling mixture into the center of each cookie. Top with sliced almonds.
Bake at 350 degrees for 12-15 minutes or until lightly browned.