Hi Barb, here are a couple versions of the Perogie Casserole.
I have tried the first one but not the second one.
You can choose which one comes closest to what you are
looking for.

6 to 7 medium potatoes, mashed
6 oz. lasagna noodles
8 oz. Colby Longhorn cheese
8 oz. Mozzarella cheese


Cook potatoes; mash them. Cook your lasagna noodles. Then
layer the noodles, cheese, potatoes and Mozzarella. Layer
as you would when making regular lasagna. You may also add
cottage cheese or Ricotta in the layers, if you like. Bake
until hot and bubbly. Taste similar to perogies.
But more economical and much easier to make.

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Cook 4 large potatoes. Mash and add 1/4 lb. white American
cheese. Cook 1/2 box lasagna noodles and drain.
Grease an oblong pan with butter. Add a little milk to
prevent sticking. Fry 2 large onions in butter. Layer
noodles and potatoes. Top with onions.
Bake at 350 degrees for 35 minutes.