In a large bowl, mix together the confectioner’s sugar, flour, and salt. Stir with a large spoon, spooning some of the mixture up and then letting it fall back down into the bowl (helping to aerate the mixture).
In a separate bowl, combine the egg whites and cream of tartar. Use a stand or hand mixer with a whisk attachment, or whisk by hand, until foamy. Gradually add the sugar, beating on high, until soft peaks form.
Fold in the vanilla and almond extract carefully, then gently and gradually fold the flour mixture into the egg white mixture, using a scooping motion. (Do not beat or overmix the batter or your cupcakes will be dense).
Spoon the batter into the cupcake tin. Bake for 18 minutes at 350 degrees F. Let cool 10 minutes in pan, then remove to a wire cooling rack. When cool, add any toppings of your choice.
Nutrition analysis (approximate per cupcake; does not include toppings): 91 calories, 0 g fat, 55 mg sodium, 20 g carbohydrate, 0 g fiber, 16 g sugar, 2.5 g protein, Vitamin D: 0%, Calcium: 0%, Iron: 2%, Potassium: 1%