Mix the flour and baking powder and knead with the oil, crème fraîche, salt, egg and chopped herbs to form a smooth dough. Grease the drip pan and roll out the dough on it. Put on the middle shelf in the oven and prebake for about 10 minutes at 190 ° C.
In the meantime, peel, clean and cut the white and green asparagus as well as the carrots or tomatoes.
Mix the crème fraîche with the eggs, flavor, starch, herbs and 100 g cheese and season the topping with salt, pepper and nutmeg.
After pre-baking, distribute the vegetables on the dough and pour the topping, sprinkle the remaining cheese on the tart and bake at 200 ° C for 45 minutes.