4 Bake tortilla
If using an oven-proof frying pan, keep the ingredients in the pan. Otherwise, lightly grease or line a baking dish. Add the onion, potatoes, peppers and eggs. Shake the dish gently so that the egg mixture ties all the ingredients together. Add both grated cheeses. Bake in the oven for 10-15 min or until set but not dry. Allow to cool for 10-15 min before serving.