Preparation of the dough:
Mix the eggs, sugar, and vanilla sugar/extract in a mixing bowl and beat with a handheld mixer until creamy. Add the quark or mascarpone/sour cream mix and beat until ingredients are combined. In a separate bowl, mix the flour, starch, and baking powder and slowly add them to the egg mixture while continually stirring. Cover the bowl with a cellophane wrap and let the dough rest for 30 minutes in the refrigerator.
In the meantime, prepare the working space next to the stove. Pour the oil into a saucepan and add a thermometer. Cover a cooling rack with a paper kitchen towel and have a fork and skimmer spoon next to it. Mix the sugar with the cinnamon.
Frying of the Quarkbällchen:
Heat up the oil to 170°C – 335°F. Use two tablespoons to shape the dough into balls. Let them slide into the hot oil and deep-fry for 3-5 minutes. Turn them around with a fork. The balls should have the size of a golf ball and float in the oil, not touching each other.
Take the balls out using the skimmer spoon. Place them on the cooling rack covered with the paper kitchen towel to drain the excess oil.
Roll them in the cinnamon-sugar mix as long as they are warm, or let them cool down to sift powdered sugar on top.
