Mix the ingredients for the dough in a bowl and knead well. Then wrap it in cling film and let it rest for 30 - 60 minutes in the refrigerator.
In the meantime, fry the onions with the minced meat in a little butter. Season with pepper, salt and paprika powder and add the garlic. Take off the stove and let cool down a bit.
Now whisk the eggs, crème fraîche and yoghurt together in a bowl and season with nutmeg, salt and pepper.
Roll out the dough about 5 mm thick and use it to line a 26 cm springform pan. Evenly distribute the minced meat with the onions in the pan and pour the egg mixture over them. Bake the quiche at 200 ° C (top / bottom heat) for about 30 - 35 minutes.