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 larges
eggs
1 tsp
vanilla
4 1/2 cups
flour
1 cup
unsweetened cocoa powder
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
vanilla
3 1/2 cups
powdered sugar
1/2 cup
unsweetened cocoa powder
2 tbsp
milk