Preheat your oven to 350°F (180°C) and grease a cake pan.
Cream together the butter and sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour and baking powder. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Stir in the vanilla extract.
Pour the batter into the prepared cake pan and bake for 20-25 minutes, or until a wooden skewer inserted into the center comes out clean. Let the cake cool completely.
Melt the marshmallows in a saucepan over low heat, stirring constantly. Add the heavy cream and stir until you have a smooth and creamy frosting.
Spread the marshmallow frosting evenly over the cooled cake. Refrigerate to allow the frosting to set.
Melt the dark chocolate and pour it over the frosted cake, spreading it evenly with a spatula.
Decorate the top of the cake with extra marshmallows or colorful sprinkles. Refrigerate for an additional 2 hours before serving.
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