In another bowl, beat the eggs, sugar, vanilla sugar, oil and milk with a hand mixer until frothy. Fold the flour into the mixture and stir everything into a smooth dough. If you want, you can also fold chocolate chips under the dough.
Fill the 24 muffin cases with 2 tablespoons each of the batter. Bake in the preheated oven at 180 ° C top / bottom heat for approx. 20 minutes on the middle rack. Take out of the oven and let cool down.
Of course, you can also use a ready-made baking mix.
Cut into the muffins all around with a sharp knife. Press the middle core down with your fingers to make a hole.
In a bowl, mix the mascarpone and whipped cream with a hand mixer to form a firm cream. Chop 1 1/2 packs of Bueno or puree with a blender. Set the rest aside. Add to the mascarpone cream with the Nutella and stir briefly.
Pour the cream into a garnish syringe and fill the muffins. Place the cupcakes in the freezer for at least 30 minutes.
In the meantime, melt the couverture, nut nougat and coconut oil over a water bath and then let cool down briefly.
Take the cupcakes out of the freezer and dip them in the chocolate. Scatter the hazelnut brittle on top and place a piece of the remaining buenos in the middle.
Place the cupcakes in the refrigerator for approx. 1 - 2 hours.