1Cook noodles according to package. While your potatoes are boiling saute onions in butter until soft. Mash your potatoes while hot and add in cheese and beat with mixer. Add in 1/3 of the onions/butter to the potato mixture and salt and pepper to taste.
2Preheat oven at 350.
Generously butter a 9x13” baking pan/dish. Place a layer of cooked noodles to cover bottom of pan, then a layer of potato mixture. Repeat ending with noodles. Spoon the rest of the butter and onion over top. Cover with foil and place pan on a cookie sheet just in case the butter runs over the sides, and bake at 350 until heated through. Approx. 30-40 min.
3*I take off foil after the 30-40 min. and sprinkle more cheese on top and place back in oven till cheese is melted. (optional)