Step 1: Preheat and Prepare

Preheat your oven to 350°F (175°C). Line two 12-cup cupcake pans with cupcake liners.

Step 2: Make the Cupcakes

Prepare the Devil’s food cake mix according to the package instructions.

Fill each cupcake liner about two-thirds full with batter.

Bake the cupcakes until a toothpick inserted into the center comes out clean, about 20 minutes.

Step 3: Cool and Hollow Cupcakes

Let the cupcakes cool in the pans for 10 minutes.

Using a teaspoon, scoop out a small well from the center of each cupcake, being careful not to go all the way through to the bottom. Reserve the cupcake crumbs for garnish.

Step 4: Stuff with Marshmallows

Place one large marshmallow into each well.

Step 5: Bake Again

Return the cupcakes to the oven and bake for another 5 minutes, or until the marshmallows are puffed and slightly melted.

Step 6: Cool Completely

Let the cupcakes cool completely to room temperature before frosting.

Step 7: Make the Chocolate Frosting

While the cupcakes are cooling, make the chocolate frosting. In a large bowl, using a hand mixer, beat together the softened butter, powdered sugar, cocoa powder, vanilla extract, and salt until combined.

Gradually beat in the heavy cream, adding more by the tablespoon if needed, until the frosting is creamy but can hold its peaks.

Step 8: Frost and Garnish

Pipe or spread the frosting onto the cooled cupcakes.

Sprinkle the reserved cupcake crumbs on top of the frosting for garnish