Pierogi Casserole

8 ounces lasagna noodles
4 tablespoons butter
2 large onions, diced
8 ounces (2 cups) sharp Cheddar cheese, grated
4 cups mashed potatoes (fresh or leftover)
Salt and pepper to taste

Cook noodles according to package directions and set aside.

Brown the butter in a medium skillet, being careful not to burn. Add the onions and sauté until softened and lightly browned. Combine the cheese and mashed potatoes. Butter or spray a 13 x 9-inch baking dish. Line the bottom with a layer of noodles. Add a layer of potato and cheese mixture then spread with a portion of the onions. Continue to layer the ingredients ending with a layer of noodles topped with onions. Bake at 350 degrees F for 15 to 20 minutes, or until bubbly and lightly browned. Tent with foil if the top browns too quickly.

Serves 6.