INGREDIENTS
1
Egg plus 2 egg whites, whole
1 1/2 cups
All-purpose flour
1 tsp
Baking powder
1/4 tsp
Baking soda
3 cups
Confectioners' sugar
3/8 tsp
Salt, fine
1 cup
Sugar
2 tsp
Vanilla, pure
2
Butter, unsalted
8 oz
Cream cheese
2/3 cup
Whole milk
1 cup rainbow sprinkles (see note)