Perfect comfort food, my kids had seconds and thirds!

Instructions:

1. Lightly grease a 9×13 casserole dish and preheat an oven to 375° F (190° C).
2. In a skillet over medium heat, add butter. Saute the onions with butter, salt, and pepper until the onions are brown and soft.
3. Place a single layer of cooked lasagna noodles in the bottom of the casserole dish.
Evenly spread 1/2 of the mashed potato on top of the noodles.

Spread 1/2 of the buttered onion on top of the potatoes. Then, sprinkle 1/3 of the shredded cheese on top. Repeat layers once more, then top with a final layer of noodles and the remaining cheddar cheese.

4. Bake for 30 minutes, or until the top is golden and bubbly. The top of the casserole will look like the below out of the oven.