Rainbow Cupcakes with Vanilla Cloud Frosting

INGREDIENTS

1 cup

butter (, softened)

2 1/3 cups

sugar

egg whites

1 tbsp

vanilla

3 cups

flour

4 tsp

baking powder

1/2 tsp

salt

1 1/2 cups

milk (, warmed for 30 sec in microwave to bring to room temp)

Rainbow colors of Gel food coloring

1 cup

butter ((2 sticks), softened)

4 cups

powdered sugar (, sifted)

1 tbsp

clear vanilla ((if you use normal vanilla it will not be as white, but will be just as delicious))

tiny pinch of salt

3 tbsp

milk