Pierogi Casserole - cooking recipe

Ingredients

3/4 lb noodles, cooked and drained (lasagna noodles or wide egg noodles)
3/4 cup butter
3 cups instant mashed potatoes, prepared
16 slices American cheese
2 large onions, minced

Preparation

Cook noodles, drain.
Melt butter and saute the onions until tender, meanwhile cook mashed potatoes according to package.
*Steps1 and 2 should be done around the same time.
Place half of the cooked noodles in the bottom of a 13x9 casserole dish.
Layer with 8 slices of cheese, all potatoes, the remaining noodles and top with remaining 8 slices of cheese.
Poke holes through the top layer of cheese; pour butter and onion mixture over top, making sure it seeps through the holes.
Serve.