INGREDIENTS
15 1/4 oz
white cake mix
1 cup
all purpose flour
1 cup
granulated sugar
3/4 tsp
salt
1 1/3 cups
water
2 tbsp
canola oil
1 tsp
vanilla extract
1 cup
sour cream
4 larges
egg whites
4 1/2 cups
powdered sugar
1 1/2 tsp
vanilla extract
3 tbsp
heavy whipping cream
1 1/2 cups