INGREDIENTS
4 cups
flour
1 cup
Dutch-process cocoa powder
1/2 tsp
baking soda
1/2 tsp
baking powder
1/2 tsp
cream of tartar
1 tsp
salt
1 cup
butter, softened
1 1/4 cups
granulated sugar + more for rolling
3/4 cup
powdered sugar
2/3 cup
canola oil
2
eggs
2 tsp
vanilla
1/2 cup
butter, softened
2 cups
powdered sugar
salt
1/2 cup
Dutch-process cocoa powder, sifted through a fine mesh strainer (to avoid lumps in the frosting)
1/3 cup
heavy cream
1/4 tsp
vanilla