Chocolate Frosting

I made cup cakes this weekend and made the BEST chocolate icing ever!!  I kind of just threw stuff in though, so I'm typing up what measurements I did do, so I can replicate it again!

• 12 Tbs. butter
• 2 C. powder sugar + about 1 cup
• ~ 2 tsp. vanilla
• 1/4-1/2 cup milk, probably on the lesser side
• 3 Tbs. Coacoa

The key to frosting though is mixing the butter lots, so it becomes light and fluffy like.