Pierogi Casserole - cooking recipe

Ingredients

12 servings prepared instant mashed potatoes (I used Idaho Instant Mashed Potatoes)
1/4 lb cheddar cheese, grated
3 large onions
1 1/4 cups butter
salt and pepper
16 ounces lasagna noodles, cooked

Preparation

.Preheat oven to 350 degrees.
Grease a 9x13 inch pan.
Saute onions in butter.
mix 1/2 of onion mixture, potatoes and cheese.
Put a layer of noodles in greased pan.
top with 1/3 of potato mixture.
repeat until there are 3 potato layers and.
4 noodle layers.
bake 350 degrees for 1 hour.
let rest 10 minutes before cutting.