Mini Irish Stout Cupcakes with Vanilla Buttercream Icing

Mini Irish Stout Cupcakes 

(From My Baking Addiction's Guinness Cupcakes)

Ingredients - Mini Irish Stout Cupcakes
1 bottle Guinness or other dark stout beer
1/2 cup milk
1/2 cup vegetable oil
1 T vanilla
3 eggs
3/4 cup sour cream
3/4 cup unsweetened dark cocoa
2 cups sugar
2.5 cups all-purpose flour
1.5 tsp baking soda

Preparation - Mini Irish Stout Cupcakes
1. Preheat oven to 350 degrees. Place paper cupcake liners in a mini cupcake baking pan.
2. Mix the Guinness, milk, oil, and vanilla together.  Beat in each egg and then the sour cream, mixing well after each addition.  
3. In a medium size bowl, whisk together the cocoa, sugar, flour, and baking soda.
4. Add the cocoa mixture to the Guinness mixture by the cupful, mixing until just combined after each addition.
5. Fill each cupcake liner 3/4 of the way full with batter and bake for 12 minutes. 
6. Let cupcakes sit in the pan for several minutes before transferring to a wire rack to cool completely. Recipe makes about 48 mini cupcakes.

Vanilla Buttercream Icing

Ingredients - Vanilla Buttercream Icing
1 stick butter, softened
1 stick unsalted butter, softened
1/2 cup shortening
1 T clear vanilla
5.5 cups powdered sugar

Preparation - Vanilla Buttercream Icing
1. Cream the butter, unsalted butter, and shortening until well mixed, about 2-3 minutes.
2. Mix in the vanilla, and then add the sugar by the cupful, mixing thoroughly. If the icing is too thick, add milk by the tablespoonful until the desired consistency is reached.