Preheat oven to 350º.
To prepare cupcakes, beat first four ingredients together until well blended (brown sugar through vanilla), 4 - 5 minutes. Add the egg and egg white, beating well to combine. Lightly spoon the flour into dry measuring cups and level with a knife. Combine the flour, baking powder, and salt in a small bowl, whisking to combine. Add the flour mixture to the sugar mixture alternating with the 1/4 cup of milk (or soy milk), beginning and ending with the flour mixture. Mix just until combined.
Spoon the batter into 10 -12 muffin cups lined with paper liners. Bake for 20 minutes or until a wooden pick inserted in the center comes out clean. Cool in the pan for 10 minutes on a wire rack, then remove from pan and cool completely on a wire rack.
To prepare the frosting, add the butter, granulated sugar and peanut butter to a stand mixer (or use an electric mixer) and beat until sugar crystals have dissolved (about 4 - 5 minutes). Add the vanilla and the milk and mix until combined. Add the powdered sugar and beat until the frosting is smooth, adding a bit more if the frosting is too thin. If the frosting is too thick you may add a teaspoon or two of milk to thin. Spread or pipe the frosting onto the cupcakes, and celebrate!!
Originally Submitted
1/26/2011
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