Easy Au Gratin Potatoes

These are pure comfort food.  They pair well with just about anything.  They are pure love in your tummy.  You'll need:

5-8 cups leftover mashed potatoes OR Make Regular Old Mashed Potatoes to start
2-3 cups shredded cheese (use whatever you have on hand)

1 medium yellow onion

1-2 Tablespoons butter or olive oil
salt and pepper
nutmeg

Spray a 9 x 13 dish with cooking spray.  (If you have less mashed potatoes-5 cups or less-then use a smaller pan.)  Spread mashed potatoes evenly in the dish.

Peel and slice the onion.  In a small pan, heat butter/olive oil until it is hot.  Add the sliced onion.  Sprinkle the onion with salt and pepper and a bit of nutmeg.  Don't go crazy with the nutmeg, just a hint of it.  It brings out the sweetness of the onion very nicely.

Cook until the onion is all brown and delicious looking and smelling.

Spread the onion over the potatoes.  (Since my kids don't like onion, I only do this on half the potatoes.)  Sprinkle cheese over the potatoes and onions.

Bake until it is heated through and cheese is melted and bubbly.