Pierogi Noodle Casserole - cooking recipe

Ingredients

1 lb egg noodles (1 bag)
1 cup butter
salt (to taste)
pepper (to taste)
1 large sweet onion (Vidalia)
1 (7 1/4 ounce) box instant mashed potatoes with four cheeses
2 2/3 cups water (for mashed potatoes)
1 1/3 cups milk (for mashed potatoes)
4 tablespoons butter (for mashed potatoes)

Preparation

Boil egg noodles until al dente. Drain. Add salt and pepper to taste. Melt 1 stick butter into the noodles.
Cook instant mashed potatoes using water, milk, and butter as required by the instructions on the box. Use whole box.
Chop onions. Melt 1 stick butter in saute pan and saute onions till soft.
In casserole pan, layer 1/2 of the noodles. Then layer 1/2 of the onions. Then layer all the potatoes. Top with remaining layers of noodles and onions. Pour all juices/butter over casserole.
Bake at 350 F for 30 minutes.