INGREDIENTS
1 cup
butter, at room temperature
3/4 cup
vegetable oil
1 1/4 cups
granulated sugar + ¼ cup, divided
3/4 cup
powdered sugar
2 tbsp
heavy cream
2
eggs, at room temperature
5 cups
all-purpose flour
1/2 tsp
baking soda
1/2 tsp
cream of tartar
3/4 tsp
salt
1/2 cup
butter, at room temperature
1 cup
sour cream
1/4 tsp
salt
1 tsp
vanilla
5 1/3 cups
powdered sugar
red food coloring