In a small frying pan, saute onions, green peppers and mushrooms in butter. Set aside.
Brown mince in a large frying pan over medium heat. Drain. Mix in passata, pasta sauce, chopped ham, chopped chicken or turkey, pepperoni or chorizo, salt, chilli flakes and black pepper. Add vegetable saute to mince mixture.
Cook pasta according to packet directions. Drain.
Spread a little sauce over the bottom of two 20x30cm baking dishes. In each dish, place a layer of pasta, a layer of mozarella cheese, a mince sauce layer, a sprinkling of Parmesan cheese, and another layer of mozarella cheese. Repeat layers. Cover dishes with foil.