INGREDIENTS
1 cup
unsalted butter
3/4 cup
vegetable oil
1 1/4 cups
granulated sugar
3/4 cup
powdered sugar
2 tbsp
water
2
large eggs
1 tsp
pure vanilla extract
5 1/2 cups
all-purpose flour
1 tsp
salt
1/2 tsp
baking soda
1/2 tsp
cream of tartar
1/4 cup
unsalted butter
6 tbsp
sour cream
1/2 tsp
pure vanilla extract
4 cups
powdered sugar
2 tbsp
milk
1
drops red food coloring, optional