2Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally until cooked through but firm to the bite, 8 minutes. Drain.
3Mix carrots, onion, and butter together in a 9x13-inch baking dish.
4Bake carrot mixture in the preheated oven until slightly tender, about 10 minutes.
5Mix macaroni, chicken, 3/4 cup mozzarella cheese, Caesar dressing, sweet bell peppers, and Parmesan cheese into carrot mixture; top with remaining mozzarella cheese.
6Bake in the preheated oven until casserole is heated through and cheese is melted, about 25 minutes.
Footnotes
Cook's Note:
Cooked sausage can also be used in place of the chicken.
Tip
Aluminum foil helps keep food moist, ensures it cooks evenly, keeps leftovers fresh, and makes clean-up easy.