Chicken Casserole

Start by cutting two red onions in half and into thin strips.

Transfer all these onions to a medium baking dish and set aside. 

Cut the tomatoes into slices and place them in the baking dish, covering all the onion strips. 

In a medium bowl, add a generous drizzle of olive oil, the soy sauce, the salt, the brown sugar, the black pepper, the oregano, the dried rosemary, the crushed garlic cloves, mix everything very well and set aside.

Then, make shallow cuts on the surface of three chicken breasts and dip these chicken breasts in the sauce we prepared.

Cover with plastic wrap and let them marinate for 30 minutes.

After this time has passed, remove the chicken breasts from the marinade, transfer them to the baking dish with the tomatoes and the onions. 

Cover with aluminum foil, take it to a preheated oven at 180° C (350° F) and bake for 40 minutes. 

After this time has passed, add the grated mozzarella cheese on top of everything, take it back to the oven and bake until the cheese melts and browns. 

Serve.