Place Stouffer's® Mac & Cheese Party Size Entree in the microwave heat in 5 minute intervals until Stouffer's® Mac & Cheese Entree is warm and you are able to mix in bacon, chicken and 1 cup cheese. Mix in chicken, bacon and 1cup of cheese into Macaroni and Cheese mix until well blended. Place in baking dish and sprinkle remaining cheese on top of casserole. Bake in oven preheated to 350 degrees until hot and bubbly and cheese is melted. Remove from oven and let stand for 5 minutes before serving.