Preheat your oven to 350°F (180°C) and line a 9-inch (22 cm) cake pan with parchment paper.
In a bowl, whisk together the flour, baking powder, and a pinch of salt.
In a separate bowl, beat the eggs with the sugar until light and fluffy. Then, add the melted butter, vanilla extract, and milk. Mix well to combine.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined and a smooth batter forms.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until golden brown and a toothpick inserted into the center comes out clean. Let the cake cool in the pan.
Whip the heavy cream with the powdered sugar until stiff peaks form. Melt the marshmallows over a double boiler or in the microwave, then gently fold them into the whipped cream.
Slice the cake horizontally into two layers. Spread half of the marshmallow cream over the bottom layer, then place the top layer on. Frost the entire cake with the remaining marshmallow cream.
Decorate the cake with colorful marshmallows or a dusting of powdered sugar. Refrigerate for at least 1 hour before serving.
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