Beat again Sift flour; measure and add salt and baking powder. Sift again.
Add dry ingredients alternately with milk and flavoring.
Beat thoroughly after each addition.
Fill greased cupcake or muffin pans ⅔ full Bake at 375 for 20 minutes
Frosting
Place the butter and peanut butter into a medium bowl, and beat with an electric mixer or briskly with a wooden spoon.
Gradually mix in the sugar, and when it starts to get thick, incorporate milk one tablespoon at a time until all of the sugar is mixed in and the frosting is thick and spreadable.
Beat for at least 3 minutes for it to get good and fluffy