Prepare Cupcakes: Bake chocolate cupcakes according to your recipe or box instructions. Let them cool completely.
Fill with Marshmallow: Carefully slice a small horizontal opening in the center of each cupcake. Fill each cavity with marshmallow fluff using a piping bag.
Glaze the Cupcakes: Melt chocolate and either dip or drizzle over the top of each cupcake to create a smooth coating. Let the chocolate set before serving.
