The cereal-and-marshmallow layers of this birthday cake don't need baking. Inside is a fluffy filling made of melted chocolate and marshmallows.
- 1 1/2 tablespoons unsalted butter
- 4 1/2 cups mini marshmallows (7 1/2 ounces)
- 3/4 cup semisweet chocolate chips
Melt butter in a medium saucepan over medium-low heat. Add marshmallows; cook, stirring, until just beginning to melt. Add chocolate and stir until smooth.