INGREDIENTS
1 cup
butter, room temperature
1 1/2 cups
sugar, divided
3/4 cup
powdered sugar
3/4 cup
vegetable oil
2
Eggs
1 1/2 tsp
cornstarch
1/2 tsp
baking soda
1/2 tsp
cream of tarter
1 tsp
salt
1/2 cup
cocoa
5 cups
flour
1/2 cup
(1 stick, 4 ounces) butter, softened
2 cups
powdered sugar
salt
1/2 cup
Dutch-process or unsweetened, natural cocoa powder
1/3 cup
heavy cream
1/4 tsp
vanilla extract