Preheat oven to 375 degrees. Spray a large 2 large casserole dish with cooking spray.

Three separate items need to be cooked. You can cook them all at once to avoid having one sit aside for too long.

If using the steam and mash potatoes, cook according to directions. While they are cooking, boil your noodles but reduce cooking time by 4 minutes to avoid overcooking. Drain and set aside.

In a small frying pan, prepare your onions by cooking in the 4 tbsp. of butter over medium heat until tender.

Once potatoes are ready in the microwave, remove from microwave and place in a mixing bowl.

Add milk, 1 cup of cheese,  salt and pepper, and onion mixture to your potatoes. Mash using a large wooden spoon or a hand held potato masher. Mash until soft, but some chunks remain. You don't want a completely smooth texture.  

Add in your noodles and toss to coat. Taste for seasoning and add more if necessary. If mixture seems dry, add more milk and butter until the entire mixture is lightly coated. Place in casserole dish. Sprinkle with the remaining 1/2 cup of cheese. Bake in your preheated oven for 25 minutes or until cheese starts to bubble. Serve immediately and enjoy!