Preheat the oven to 375°F, and spray a 9x13-inch baking dish with non-stick spray.
If the chicken is very thick, slice it in half horizontally. Season the chicken with garlic powder, salt, and pepper, and place it in the prepared baking dish.
Pour the spaghetti sauce over the chicken breasts, covering them completely.
Bake the chicken breasts for approximately 20 minutes, until the internal temperature reaches 165°F and the juices run clear.
Remove the chicken from the oven.
Sprinkle Parmesan cheese on top. You may add mozzarella cheese if you like.
To brown the cheese, turn your oven to broil and broil until the cheese turns brown. This may only take a minute or two.
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Recipe Tips
Serve with pasta tossed with pesto sauce.
You can prepare this recipe with boneless pork chops.