Cook tortellini according to package directions and drain. Preheat oven to 375°F. Mix Alfredo sauce, cream cheese, garlic, salt, and pepper until smooth. Stir in chicken, spinach, artichokes, and tortellini. Transfer to greased baking dish. Top with mozzarella and parmesan. Bake uncovered for 25–30 minutes until bubbly. Rest 5 minutes before serving.