Preheat your oven to 350°F (180°C) to ensure it reaches the desired temperature while you prepare the batter.
In a bowl, whisk together the eggs and sugar until light and fluffy. You can use a whisk or an electric mixer.
Add the oil, milk, and vanilla sugar, and mix well until combined.
In a separate bowl, whisk together the flour, baking powder, and a pinch of salt. You can add all the dry ingredients without sifting, but sifting helps to avoid lumps.
Gradually add the dry ingredients to the egg mixture, mixing continuously until you have a smooth, lump-free batter.
Divide the batter evenly among the muffin liners. Fill them about 2/3 full to allow room for the cupcakes to rise.
Bake the cupcakes for 20-25 minutes, or until a toothpick inserted into the center comes out clean. They are ready when the tops are slightly raised and golden brown.
Once the cupcakes are completely cooled, prepare the marshmallow frosting. Gently melt the marshmallows in a small amount of water or heavy cream until smooth and liquid.
Pour the marshmallow frosting over the top of the cupcakes. You can also use it as a decoration to make the appearance more special.
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