Preheat Oven to 375°F:
Heat oven to 375°F (190°C) and adjust rack to upper third position.Slice and Season Chicken:
Slice each chicken breast lengthwise into two equal cutlets, then season both sides with salt and pepper.Mix Ricotta Filling:
In a medium bowl, combine ricotta, parmesan, minced garlic, and Italian seasoning; stir until uniform.Spread Marinara in Dish:
Spread half the marinara sauce evenly over the bottom of a 9x13-inch baking dish.Arrange Chicken and Ricotta:
Place chicken pieces side by side in the dish, then evenly distribute the ricotta mixture on top of each cutlet.Top with Remaining Sauce:
Spoon remaining marinara sauce over each piece of chicken.Bake Covered for 20 Minutes:
Cover dish tightly with aluminum foil and bake for 20 minutes.Add Mozzarella and Finish Baking:
Remove from oven, discard foil, and sprinkle mozzarella over the chicken. Return to oven uncovered and bake until chicken reaches an internal temperature of 165°F (75°C), about 15 minutes.Broil to Brown Cheese:
Optionally, switch to broil for 1-2 minutes to brown the cheese, watching carefully to prevent burning.Rest and Garnish:
Let rest several minutes before serving. Adjust seasoning with additional salt and pepper if desired, and garnish with fresh basil.