First mix together your cupcake ingredients to make a somewhat runny dough, then line a cup cake baking dish with wrappers to fill and spray with a light coating of coconut oil. Fill each cup about 3/4 the way full.

Make the frosting by softening up your butter, then mixing it your peanut butter. Once combined add vanilla extract and milk. Finally add powdered sugar until the runny mixture becomes the texture you're looking for.