Pierogi Casserole 2 Recipe

Mix mashed potatoes and cheeses with a mixer. Sauté the onions in the margarine until soft. Add 1/3 of the onions to the potato mixture. Add salt to taste. Generously grease a 13 x 9 x 2 inch baking dish. Place a layer of lasagna noodles in dish, then a layer of potato mixture. Repeat layers, ending with noodles. Pour remaining cooked onions over all. Cover with foil and bake at 350° until heated through.