In a large bowl combine tortellini, alfredo sauce, garlic, pesto, mozzarella cheese and chicken if using.
Pour into a greased 13x9-inch baking dish.
Preheat oven to 375°F. Cover with foil and bake 50 minutes. Remove foil and bake an additional 10 minutes until browned and bubbly.
Notes
To turn into a freezer meal:
Pour into a greased 13x9-inch disposable foil pan. Top with Parmesan cheese. Cover with plastic wrap and aluminum foil. Label and freeze.
To cook from frozen, preheat oven to 375°F. Remove plastic wrap and foil and then cover again with foil. Bake 50 minutes. Remove foil and bake an additional 10 minutes until browned and bubbly.