Preheat oven to 375°F (190°C). Lightly grease a baking dish with olive oil or spray.
Place chicken breasts in the dish, season with salt, pepper, and Italian seasoning.
Pour marinara sauce evenly over the chicken breasts.
Top with shredded mozzarella and grated Parmesan cheese.
Bake uncovered for 25–30 minutes, or until chicken is fully cooked and cheese is bubbly and golden.
Garnish with chopped basil or parsley and serve hot with pasta, rice, or vegetables.