1. Combine flour, sugar, and baking powder in a large bowl. In a separate bowl, mash the banana and then mix it with the quark, vanilla extract, and egg until smooth. Add these wet ingredients to the bowl with the flour and mix well. Let the dough sit for about 5 minutes, so the flour can absorb the moisture.

2. Line the basket of an Air Fryer with baking parchment* and lightly grease the paper. If your Air Fryer needs to be preheated, preheat your device to 180°C (350°F).

3. Prepare a small bowl with a little flour. Using a cookie scoop* (Ø 5cm) or a tablespoon, scoop out portions of dough, drop them briefly into the flour, and shape them into balls. Remove any excess flour. Place the balls in the basket, leaving enough space between them (we can fit five balls in our 4-liter basket) and bake them for about 10 minutes. Flip the quark fritters over halfway through the baking time to ensure they’re browned all over – be careful, they are very hot! The bottom of the balls will still be raw after the short baking time, but that’s okay.

4. While the quark fritters are baking, melt the butter and mix the brown sugar with the ground cinnamon in a bowl. Remove the baked quark fritters from the Air Fryer, brush them with melted butter, and then roll them in the sugar and cinnamon mixture. Keep the fritters warm. Use the remaining dough to bake more fritters until everything is used.