I started by placing the chicken breasts in a bowl and coating them with Italian dressing. After covering, I refrigerated them for at least two hours. This step made the chicken incredibly flavorful and tender.
While the chicken marinated, I mixed chopped tomatoes, garlic, basil, and olive oil in a bowl. This fresh topping adds brightness and contrast to the creamy pasta.
I boiled the penne in salted water until al dente, then drained it thoroughly. Keeping the pasta firm helps it hold up under the creamy sauce.
The marinated chicken was grilled over medium-high heat until fully cooked. After resting briefly, I sliced it into strips for easy serving.
I combined the cooked pasta, Alfredo sauce, and chicken in a greased baking dish. After topping it with shredded cheese, I baked it until bubbly and lightly golden.
Just before serving, I spooned the fresh tomato basil mixture over the hot pasta. This final step adds color, freshness, and extra flavor.