2. For the crumble topping, combine the softened butter, sugar, egg, flour, baking powder, and a pinch of salt in a bowl and rub together with your hands until crumbly. Set aside two-thirds of the mixture to sprinkle over the muffins later.
3. For the quark filling, in a separate bowl, combine the quark, sugar, egg, melted butter, vanilla pudding powder, and lemon zest until smooth.
4. Line the bottom of the muffin cups with the prepared crumble topping and press down lightly. Then, evenly distribute the quark filling over the crumble.
5. Generously sprinkle the remaining crumble topping over the quark filling.
6. Bake the muffins in the preheated oven for about 25–30 minutes, or until golden brown.
7. Remove the muffins from the oven, let them cool slightly, and enjoy!
These quark crumble muffins are always a hit and impress with their moist quark filling and buttery crumble topping. Perfect for any occasion!
