- 12
- 30 mins
- 55 mins
Ingredients
- 1 1/4 cups all purpose flour
- 1/2 cup unsweetened cocoa powder
- 3/4 teaspoon baking soda
- 1/4 teaspoon salt
- 1 cup granulated sugar
- 1/3 cup vegetable oil
- 1 egg
- 1 teaspoon vanilla
- 3/4 cup buttermilk
- 1 (4.4-ounce) milk chocolate candy bar, divided
- 4 cups confectioners' sugar
- 1 cup (2 sticks) butter, at room temperature
- 3 tablespoons milk
- 1/2 cup mini marshmallows
Preparation
Step 1
Preheat oven to 350˚F. Spray heatproof mugs with nonstick spray. Mix the flour, cocoa, baking soda and salt together in a medium bowl until well blended. Set aside.
In the bowl of an electric mixer, mix the sugar, oil, egg, and vanilla on low until smooth, about 2 minutes. Add half of the flour mixture and half of the buttermilk and mix for 1 minute. Add the remainder of the flour and buttermilk and mix until smooth and glossy, about 1 minute more.
Scoop the batter into the prepared mugs, filling 2/3 full. Break the candy bar into 12 squares and press one into each cupcake. Bake for 22–25 minutes or until a toothpick inserted into the center comes out clean. Cool thoroughly.
For the frosting, mix the confectioners’ sugar, butter and milk until smooth; pipe onto the cupcakes. Shave curls from the remaining candy bar with a vegetable peeler; sprinkle on top of each cupcake and top with the marshmallows.