INGREDIENTS
1
box white cake mix
4
egg whites
1/3 cup
oil
1 cup
buttermilk
1/2 cup
sour cream
1/4 cup
mayonnaise
1 tbsp
vanilla extract
2 tbsp
freeze dried strawberries, pulverized in the food processor
2 tbsp
freeze dried raspberries, pulverized in the food processor
1 cup
butter, softened
1 tsp
vanilla extract
4 cups
powdered sugar
milk, if needed