INGREDIENTS
2 1/2 cups
all purpose flour
1/2 tsp
baking powder
1/2 tsp
salt
1/2 cup
unsalted butter (softened)
1 cup
sugar
1
large egg
2 tbsp
sour cream
1 tsp
vanilla extract
5 tbsp
unsalted butter (softened)
3 tbsp
milk
1 tbsp
vanilla
4 cups
powdered sugar
food coloring (optional)