INGREDIENTS
1 cup
unsalted butter
2 cups
confectioners sugar
1
egg
2 tsps
vanilla bean paste
1 tbsp
red velvet cake mix
2 tbsps
milk
1/2 cup
cocoa powder
1/4 cup
buttermilk powder
3 1/4 cups
flour
2 tsps
baking powder
1/2 tsp
salt
1 tbsp
apple cider vinegar