These cupcakes are a touchdown of flavor. The moist, nutty peanut butter base pairs perfectly with the rich, creamy chocolate frosting, delivering a delightful balance of sweet and savory in every bite.
Preheat your oven to 350°F. Line a 12-cup cupcake pan with liners and set it aside.
In a small bowl, whisk together the flour, baking powder, and baking soda. Set aside.
Mix the vanilla extract into the milk and set aside.
In a large mixing bowl, use an electric mixer to beat the butter until creamy and smooth.
Gradually add the brown sugar and eggs to the butter. Beat until fully combined, scraping down the sides as needed.
Add the peanut butter and sour cream, then beat until smooth and creamy.
With the mixer on low, alternate adding the dry ingredients and the milk mixture to the bowl. Mix until just combined. Increase speed and beat until the batter is fluffy.
Spoon the batter evenly into the prepared liners, filling each about ¾ full.
Bake for 17–18 minutes, or until a toothpick inserted in the center comes out clean. Let the cupcakes cool on a wire rack.
For the Frosting:
In the bowl of an electric mixer, beat the butter until creamy (about 1 minute).
Slowly mix in powdered sugar and vanilla extract until combined.
Gradually add milk, a tablespoon at a time, until you reach the desired consistency.
Reserve about ¼ cup of the frosting in a piping bag with a small round tip for the football stitching.
To the remaining frosting, add cocoa powder and chopped chocolate chips. Beat until smooth.
Transfer the chocolate frosting to a piping bag with a large round tip. Pipe swirls onto the cooled cupcakes. Use the reserved white frosting to pipe football stitching patterns on top.