Preheat oven to 350ºF. Spray a 9×13-inch baking dish with cooking spray.
In a large bowl, mix together cooked rice, ricotta, sour cream, green peas, garlic salt, pepper, Italian seasoning, ½ cup shredded mozzarella cheese, and ½ cup grated parmesan cheese. Spread rice mixture into the bottom of the prepared baking dish.
Brown meat; drain off fat and return to skillet. Add garlic and cook for 30 seconds. Add tomato sauce, Italian seasoning, and onion. Stir and simmer for 5 minutes.
Spread meat sauce on top of rice. Sprinkle ½ cup shredded mozzarella cheese and ½ cup grated parmesan cheese on top of casserole.
Bake uncovered for 30 to 35 minutes.
