INGREDIENTS
2 1/2
cups/312 grams all-purpose flour, more for rolling
1
teaspoon/5 grams baking soda
1
teaspoon/3 grams cream of tartar
1/2
teaspoon/3 grams kosher salt
1
cup/228 grams unsalted butter (2 sticks), at room temperature
1 1/2
cups/188 grams confectioners sugar
2
teaspoons/10 milliliters vanilla extract
1
large egg
3 3/4
cups/1 pound/454 grams confectioners’ sugar
3
large egg whites
1/2 tsp
cream of tartar
kosher salt
Food coloring, as needed