Clean, wash and cut the peppers into pieces. Clean, wash and slice the tomatoes. Peel and slice onions. Cut cabanossi into slices. Heat oil in a pan.
Fry the peppers and onions for four minutes while turning. Add the tomatoes and fry for another two minutes. Add cabanossi, season with salt, pepper and paprika. Wash the marjoram, dab dry and chop coarsely, except for a few leaves for garnishing.
Spread the baguette with butter and sprinkle with marjoram. Layer the vegetables, cabanossi and baguette in a greased ovenproof dish. Sprinkle baguette with cheese. Bake in the preheated oven (electric oven: 200 °C / gas: level 3) for 15 to 20 minutes.
Garnish with remaining marjoram.