In a heated pan pour the olive oil. Slightly fry onion, then add diced bell pepper and zucchini. Add salt and pepper to taste.
While the vegetables stew, grate on a grater cheese (instead of mozzarella you can take any solid variety).
At the bottom of the form that will be baked lasagna, add a little tomato sauce and begin to arrange the layers. The first layer of dough (it should cover the bottom of the form), then the sauce, a layer of sauteed vegetables and grated cheese. Repeat the layers several times. The latter should be a layer of vegetables, sprinkle it lightly with cheese.
Bake the lasagna in the oven for 45 minutes at 180°C.
Ready lasagna can be decorated with greenery, such as leaves of Basil for fragrance.