INGREDIENTS
1/2 cup
butter
1 cup
granulated sugar
1
egg
1
egg white
1 1/2 Tbsps
sour cream
1 tsp
vanilla extract
2 1/2 cups
all purpose flour
1/2 tsp
baking powder
1/2 tsp
salt
1/4 cup
unsalted butter
2 cups
powdered sugar
2 Tbsps
half and half
1/2 tsp
vanilla
1