Heat your oven to 350 and line cupcake pan with cupcake liners

Stir together sugar, flour, cocoa, baking powder, baking soda, and salt in large bowl. Add your eggs, milk, and oil. Beat with a mixer for 2 minutes. Set aside.

Break Graham crackers in half and place in ziplock bag. Pound with cookie roller until finely crushed.

Scoop 1 Tablespoon of graham cracker into cupcake tin and then scoop chocolate cake batter onto graham cracker. Push in 3 small marshmallows in center.

Bake for 20 minutes.

Let cupcakes cool. Once cooled, put on wire rack.

Place softened butter in mixing bowl and add in the cocoa and powder sugar. Mix on low until combined. Scrap sides and add in the extract.

Add in heavy cream and scrap down the sides.