Wash the mushrooms well, clean, cut in half and large quarters. Peel the onion and cut into rings.
Melt the butter in a saucepan and add the mushrooms with the onion rings. Put the lid on the pot and simmer the mushrooms for a few minutes, stirring occasionally. Season with salt, pepper and paprika powder and stir 1 - 2 tablespoons of cream cheese into the cooking stock (the mushrooms give off their own juice). Cook for 2-3 minutes, then the mushrooms should be ready.
Tzatziki or another garlic sauce can be served with it. The garlic sauce can also be seasoned with a little tomato paste or ketchup.
Of course, this mushroom pan also goes well with many other lunch dishes, e.g., with pasta (absolutely delicious) or rice or potatoes.