These peanut butter banana cupcakes are studded with crunchy peanuts and topped with a rich buttercream frosting. They're simple to make, perfect for peanut butter lovers, and they're ready in just under an hour!
Preheat your oven to 350 degrees Fahrenheit. Line 2 cupcake pans with 18 cupcake liners. Add the egg whites to a medium-sized mixing bowl and whisk using electric beaters until soft peaks form.
Use a fork to mash the bananas in a large mixing bowl. Then, add the egg yolks, melted butter, sugar, peanut butter, milk, sour cream, and vanilla and use electric beaters to cream everything together.
Add the dry ingredients to the wet ingredients and beat on medium until the batter starts to come together. Fold in the egg whites until just combined -don’t over-mix the batter.
Spoon the batter into the cupcake liners, filling ⅔ full. Bake for about 11 – 13 minutes, or until a toothpick inserted into the center comes out clean. Don’t over-bake these as they will firm up as they cool.