01 - In a large baking dish, evenly combine uncooked penne pasta, diced chicken breast, and marinara sauce.
02 - Scatter halved cherry tomatoes over the top, cover tightly with aluminum foil, and bake at 350°F for 25 minutes.
03 - Remove the foil, top with mozzarella balls, and bake uncovered for 5 additional minutes or until cheese is melted.
04 - Remove from oven and garnish with fresh basil leaves before serving.