Step 1: Cook lasagna noodles in heavily salted boiling water until al dente.
Step 2: Drain and set aside.
Step 3: Preheat oven to 375 degrees.
Step 4: Spray a 13"x 9" baking dish with cooking spray.
Step 5: Melt butter in large skillet over medium heat.
Step 6: Saute onions with a little salt and pepper until soft and lightly browned, about 8 minutes.
Step 7: Stir onion mixture and 1 cup of the cheese into the mashed potatoes.
Step 8: Add more pepper to the potato mixture to taste.
Step 9: Spread 4 of the lasagna noodles on the bottom of casserole dish and top with 1/2 of the potato mixture.
Step 10: Repeat with another layer of lasagna noodles and mashed potatoes mixture and place final 4 lasagna noodles on top.
Step 11: Sprinkle reserved cheese on top.
Step 12: Cover baking dish with foil and bake 35 minutes or until heated through.
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