Quiche (without crust) with zucchini, cheese and pancetta - Simple and quick recipe

Ingredients:
- 500 grams of sliced ​​zucchini
- 2 tablespoons of chopped parsley
- 80 grams of onion
- 2 cloves of garlic
- 60-70 grams of pancetta
- 4 large eggs
- 2-3 tablespoons of sour cream
- 50 milliliters of olive oil (you can also use vegetable oil)
- half a teaspoon of black pepper
- 1 teaspoon of salt
- 60 grams of flour
- grated parmesan cheese
- 120 grams of gouda cheese
- marjoram leaves or half a teaspoon of dry oregano
- half teaspoon of butter
- 2 to 3 tablespoons of bread crumbs