Spray baking sheets with no-stick cooking spray and preheat oven to 400° F.
Combine granulated sugar, almond paste and orange zest using an electric mixer. Add the egg whites and beat until totally combined and smooth. Dough should be soft. Using a pastry tube, pipe 1/2-inch dots of dough 2 inches apart on a baking sheet. If you don't have a pastry tube or prefer not to use it, you can shape the cookies by using 2 spoons to make scant 1 tablespoon mounds of dough on the baking sheet.
Bake 10 minutes or until golden and set. Let sit on pan 5 minutes to cool. Remove to wire racks. Sprinkle with confectioners' sugar.Makes 200 cookies Source: