Preheat oven to 375 degrees and grease a 9x13 inch baking dish with butter or nonstick spray. Cook lasagna noodles according to package directions, and set aside. In a large skillet add onion, butter, salt and pepper. Saute on medium heat until soft, about 10 minutes. Place 4 lasagna noodles in an even layer on bottom of baking dish. Layer 1/2 of total mashed potatoes on top of noodles, followed by 1/2 of the sautéed onions, and 1/2 cup of cheese. Repeat with another layer of lasagna noodles, remaining mashed potatoes, sautéed onion and 1/2 cup cheese. Top lasagna with remaining 4 noodles and 1 cup cheese. Bake for 30 minutes or until hot and bubbly. Serve hot
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