Ingredients
- Cupcake:
- 1 2/3 cups all-purpose flour
- 1 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/2 teaspoon salt
- 3/4 cup firmly packed light brown sugar
- 5 tablespoons creamy natural peanut butter
- 2 tablespoons unsalted butter, softened
- 3/4 cup mashed ripe bananas
- 2 large eggs
- 1 1/2 teaspoons vanilla extract
- 1/2 cup milk
- Frosting:
- 3/4 cup marshmallow fluff
- 2 tablespoons unsalted butter, softened
- 2 tablespoons vegetable shortening
- 1 teaspoon vanilla extract
- 1 1/2 cups confectioners’ sugar, or as needed
- 2 tablespoons milk
Directions
Preheat oven to 350 degrees F (175 degrees C). Line 12 muffin cups with paper liners.
Sift flour, baking powder, baking soda, and salt together in a bowl.
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Beat brown sugar, peanut butter, and 2 tablespoons butter together in a bowl using an electric mixer on medium speed until creamy, about 1 minute. Beat banana, eggs, and 1 1/2 teaspoons vanilla extract into creamed peanut butter mixture until incorporated, about 1 minute.
Beat flour mixture, alternating with 1/2 cup milk, into creamed peanut butter mixture until batter is well combined; pour into muffin cups.
Bake in the preheated oven until a toothpick inserted in the center of a cake comes out with moist crumbs, 20 to 23 minutes. Cool cupcakes in the tin for 15 minutes before transferring to a wire rack to cool completely.
Beat marshmallow fluff, 2 tablespoons butter, shortening, and 1 teaspoon vanilla extract together in a bowl using an electric mixer until smooth. Gradually beat confectioners' sugar, alternating with 2 tablespoons milk, into marshmallow mixture until desired thickness is reached; chill in refrigerator until thickened, about 15 minutes.
Spread frosting over cupcakes or pipe through a pastry bag.