Prep the oven and pan. • Preheat the oven to 350°F and grease and flour 18 cupcake cups or line with cupcake papers.

Make the batter. • In a mixing bowl, using an electric mixer, beat the butter, brown sugar, and peanut butter until light and fluffy. Beat the eggs and vanilla into the creamed mixture.• In another bowl, combine the flour, salt, and baking powder; mix with a spoon or whisk to blend.• Add the dry ingredients to the first mixture, alternating with the milk. Blend until smooth.

Bake the cupcakes. • Fill the prepared cupcake cups about 2/3 to 3/4 full. Bake for 23 to 27 minutes, or until a wooden toothpick inserted in the center comes out clean.