We cut the chicken into pieces and season it well with salt and pepper. Let's let it flavor.
In the meantime, we prepare the sauce: in a pan with a drizzle of olive oil we fry onions, carrots and chopped celery. Then add the tomato sauce, salt and cook for about 5 minutes.
Now we stuff the pieces of chicken well and place them in a buttered baking dish. We cover the chicken with the tomato sauce and then add the béchamel sauce, distributing it on top with a spoon. Finally we sprinkle with grated cheese.
We bake in a ventilated oven at 190 degrees for about 45 minutes, or in a static oven at 200 degrees C for the same time.
Here it is ready: do you feel that they smell appetizing?