Preheat oven to 350, which takes about 15 mins. Grease pan. While you're waiting for the oven to preheat take out the cooked Macaroni and mix up all the ingredients. There's no particular order except do not put the slices of yellow cheese in yet. Once the ingredients are set, start pouring in the ingredients into the main dish bowl that you put into the oven. Layer the bottom of the pan with the slices of yellow cheese. Then pour in about one-third of the ingredients and layer that with yellow cheese. Continue the layering until your ingredients are fully in the pan and you only have the top layer. Cook until the top layer starts to brown, about 30 mins. Making macaroni and cheese is very simple and you can adjust to your own preference.