Cook the pasta in 3-4 l boiling salted water (1 teaspoon salt per litre) according to the instructions on the packet. Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Drain peppers and tuna.
Cut the peppers a little smaller. Mix tomato sauce, cream cheese and possibly 2-3 tablespoons of pasta water, season with salt and pepper.
Drain the pasta and mix with the paprika, tuna and sauce. Pour into a casserole dish. Grate cheese, mix with breadcrumbs and sprinkle over. Bake in the oven for 10-15 minutes.