Preheat your oven to 375°F (190°C).
Season the chicken breasts with salt and pepper, making sure to coat them evenly for flavor.
Heat olive oil in a skillet over medium heat. Once the oil is hot, add the chicken breasts and cook for about 4-5 minutes per side until they are browned.
Transfer the browned chicken to a baking dish, and pour marinara sauce over each piece, ensuring a nice coating.
Top the chicken with shredded mozzarella cheese, making sure each piece is generously covered.
Bake in the preheated oven for 20-25 minutes, or until the chicken is cooked through and the cheese is bubbly and golden.
Serve hot, garnished with fresh basil, if desired. Enjoy!