"It's hard not to love a super-moist chocolate cupcake stuffed with gooey filling that transports you straight back to your youth. Best of all, this one starts with a one-bowl cupcake recipe...."
INGREDIENTS
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For the Cupcakes:
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1 cup flour
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6 tablespoons unsweetened cocoa powder
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1 teaspoon baking soda
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1 teaspoon baking powder
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1/2 teaspoon salt
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1/4 cup vegetable oil
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1 cup sugar
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1 egg
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1/2 cup buttermilk
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1 teaspoon vanilla extract
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1/2 cup hot coffee or hot water (see Ingredient Note)
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For the Filling:
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4 tablespoons butter, softened
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1 cup powdered sugar
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1 cup marshmallow fluff
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2 teaspoons milk
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For Chocolate Topping:
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5 ounces semi-sweet or bittersweet chocolate pieces or chips
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1/4 cup unsalted butter
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For Piped Icing:
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1/2 cup powdered sugar
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2 tablespoons butter, softened
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1 to 2 teaspoons milk