Funfetti Cupcakes

1/2 cup milk 
3 egg whites 
2 tsp vanilla 
1 1/4 cups flour 
1 cup sugar 
1/2 tsp salt 
2 tsp baking powder 
6 tbsp room temperature butter 
2 tbsp rainbow sprinkles 

1. Preheat oven to 350F. Line a muffin tin with cupcake liners. 
2. In a measuring cup, whisk together milk, egg whites and vanilla extract. 
3. In a separate bowl, whisk together flour, sugar, salt and baking powder. Cut in butter until mixture resembles coarse crumbs. 
4. Beat in milk. Fold in sprinkles. 
5. Bake for 15 minutes, or until an inserted toothpick comes out clean. 

Magnolia Buttercream Icing

1 cup unsalted butter, softened 
6-8 cups icing sugar 
1/2 cup milk 
2 tsp vanilla

1. Place butter in a large mixing bowl. Slowly beat in 4 cups of icing sugar and beat for 3-5 minutes. 
2. Gradually add the remaining amount of icing sugar (beating well after each addition), until desired spreading consistency is achieved.