INGREDIENTS
2
Egg whites, large
1 cup
All-purpose flour
1 tsp
Baking powder
2 tbsp
Cornstarch
2/3 cup
Granulated sugar
1/2 tsp
Kosher salt
1 1/4 cups
Powdered sugar
1/4 cup
Rainbow sprinkles
1
Rainbow sprinkles
1 pinch
Salt, fine
1 tsp
Vanilla
1 cup
Butter, unsalted
1/2 cup
Buttermilk
1 tbsp
Milk or cream