Peel the onion and chop finely. Melt the margarine in a saucepan and let the onion become translucent in it, mash the clove of garlic and cook with it. Now add the spinach and cook for another 5 minutes.
Wash, clean and quarter the mushrooms and add to the spinach. Pour on the white wine and stew for another 5 minutes.
Then stir in the sour cream and season with pepper, salt and nutmeg.
Put the vegetables in a flat baking dish and sprinkle with the cheese. Baked light brown in the oven at approx. 180 - 200 degrees.