First wash and drain the chicken breast fillet. Season with salt and pepper on both sides. Heat the frying pan and brown the meat on both sides in the oil, it can stay raw on the inside. Put aside.
Cut the peppers into strips and the onions into cubes.
Cut the chicken breast fillet into bite-sized pieces and continue frying briefly in the frying pan. Add the onions and fry for 5 minutes. Add the tomatoes and the stock and let everything simmer uncovered for 10 minutes so that the liquid boils down. Add the processed cheese and stir until it has melted. Add the peppers and cover and simmer for another 5 minutes. If you like the sauce more liquid, you can add more stock. Season with salt, pepper and paprika before serving.