Heat the oil in a frying pan. Thickly slice the onions and peppers. Fry until soft.
Mix all of the the spices and seasoning together and then sprinkle over the onions and peppers.
Add tomato puree (paste), tinned tomatoes (or passata) and plum tomatoes, and cook for around five minutes.
Pour a little of the sauce over the bottom of the your baking dish (mine is 28cm x 21cm or 11" x 8¼").
Cover with two of the tortillas. To fit the dish, I placed one whole tortilla in the centre of the dish, and cut the other tortilla in half and placed them either side.
Pour half of the mixture over the tortillas. Sprinkle over your cheese (as much or as little as you like).
Cover with two more tortillas (in the same way as above) and then add the rest of the sauce.
Top with last two tortillas as before, and cover with cheese.
Bake on 175℃ (350℉) for around 20-25 minutes until the cheese is has turned brown and you can see a little of the sauce bubbling up through the tortillas. Serve hot/warm with a fresh salad. Enjoy!