Cook the pasta in salted water according to the instructions on the packet.
Fry the minced meat with onions and season. Add tomato paste and mustard and deglaze with stock. Stir in the sour cream. Possibly bind a little with parmesan cheese. Add the paprika strips and drained mushrooms and simmer a little.
Mix the pasta with the sauce, place in a large baking dish, sprinkle with cheese and bake at 180 ° C until the cheese has melted nicely.