Step 1: Preheat the Oven

Start by preheating your oven to 350°F (175°C). Line a standard muffin tin with cupcake liners to prepare for your batter.

Step 2: Mix the Dry Ingredients

In a large mixing bowl, whisk together the flour, cocoa powder, sugar, baking powder, baking soda, and salt until well combined. This ensures an even distribution of all dry ingredients.

Step 3: Combine Wet Ingredients

In another bowl, whisk together the vegetable oil, eggs, vanilla extract, and buttermilk until smooth. This mixture will create a rich batter when combined with the dry ingredients.

Step 4: Combine the Mixtures

Gradually pour the wet ingredients into the dry ingredients, stirring gently until just combined. Be careful not to overmix; a few lumps are okay!

Step 5: Fill the Cupcake Liners

Spoon the batter into the prepared cupcake liners, filling each about two-thirds full. This allows enough room for the cupcakes to rise without overflowing.

Step 6: Bake the Cupcakes

Place the muffin tin in the preheated oven and bake for 18-20 minutes, or until a toothpick inserted in the center comes out clean. Once baked, remove from the oven and let them cool in the pan for about 5 minutes before transferring to a wire rack to cool completely.

Step 7: Prepare the S’mores Filling

Once the cupcakes are cooled, it’s time to prepare the filling. In a small bowl, combine the mini marshmallows and graham cracker crumbs. Set aside.

Step 8: Core the Cupcakes

Using a cupcake corer or a knife, carefully remove the center of each cupcake. Be gentle to avoid tearing the edges. You want to create enough space to fill with the s’mores mixture.

Step 9: Fill the Cupcakes

Spoon the marshmallow and graham cracker mixture into the center of each cupcake. Pack it in lightly, ensuring they are filled but not overflowing.

Step 10: Make the Frosting

In a mixing bowl, beat the softened butter with an electric mixer until creamy. Gradually add the powdered sugar, heavy cream, and vanilla extract, mixing until smooth and fluffy. Adjust the consistency with more cream if necessary.

Step 11: Frost the Cupcakes

Using a piping bag or a spatula, generously frost the tops of the filled cupcakes. You can create swirls or simply spread it evenly for a classic look.

Step 12: Create the Marshmallow Ghosts

To make the ghostly decorations, place a large marshmallow on top of each frosted cupcake. Use a toothpick to gently press chocolate chips into the marshmallow to form eyes. You can create different expressions for added fun!