Prepare lasagna noodles according to package directions; drain and lay out on parchment paper until ready to use.
Prepare instant potatoes according to package directions.
Add the butter and onions to a sauce pan and melt over medium heat.
Place 1/4 cup of the butter mixture in the bottom of a 13x9 baking dish.
Add a single layer of noodles (about 1/3 of the package).
Top with 1/3 of the prepared potatoes and spread to cover noodles.
Drizzle with 1/4 cup of the butter mixture.
Top with a single layer of cheese slices (about 6-8 slices).
Add two more layers of noodles, potatoes and butter.
Top with a final layer of cheese.
Bake in a 350 degree oven for 25-30 minutes or until cooked through and bubbly.
Notes
Make Homemade Mashed Potatoes: Make them how your family likes them, cheesy or add sour cream, cream cheese etc. Great way to use up leftovers.
No-boil Noodles: It is a lot less work to use this noodle.
Add: Feel free to add sliced mushrooms to the potatoes or whatever else your family loves for this comfort food recipe.
Variation tip: Recipe Hack is to roll up your noodles with the saute onions and add mashed potatoes and make individual portions of the pierogi lasagna.