Wash the mushrooms, unscrew the stem, set aside for the filling. Scrape out the lamellas with a teaspoon so that there is a hollow for the filling. Put mushrooms on a baking sheet.
Chop the mushroom stalks and onion into small pieces. Fry the onion in a little oil or butter. When it is translucent, add the leftover mushrooms and sauté. Mix in the cottage cheese and tomato paste. Then season with salt, pepper and paprika powder. If you like, you can also add garlic and herbs.