Using the whisk on a hand mixer, beat the eggs, sugar and vanilla sugar in a bowl for approx. 3 mins. until light and fluffy. Stir in the quark. Mix the flour, baking powder and sodium bicarbonate, mix quickly into the quark mixture.
Mix the sugar and cinnamon in a deep dish, set aside. With lightly floured hands, shape the dough into balls (approx. 4 cm in diameter). Heat the oil in a cooking pot to 180°C. Deep fry the balls in batches for approx. 5 mins. Remove the quarkini with a slotted spoon, drain on kitchen paper, toss in the cinnamon sugar while still warm.