I literally use this butter frosting recipe for EVERY. THING. THAT. REQUIRES. FROSTING. It's versatile, based on the amount of additional milk you add.
Category: Dessert, Frosting
1/3 Cup Butter (5 1/3 Tablespoons), melted
4 1/2 Cups Powdered sugar
1/4 Cup Milk
1 1/2 teaspoon Vanilla
1. Whip Butter, Powdered sugar, Milk and Vanilla. This is a nice stiff frosting by itself, and you could stop here. It's too stiff for piping, and too stiff for frosting a cake... but good for piling on to delicious hot brownies!
2. Add milk, a few drops at a time, to get desired consistency. Note to those, from experience. If you get your frosting too thin, it will SLIDE OFF OF THE CAKE! *laughing* Thick is better than thin if you're not sure.
3. To make chocolate frosting, substitute 1/2 Cup of Cocoa and 1/2 Cup of Powdered Sugar. It's delicious. Trust me.