In a large pot of water, boil the sliced potatoes and onions for about 20 minutes - to soften them up

Meanwhile, grab a large casserole dish and prepare it with non-stick cooking spray

Preheat your oven temperature to 350 degrees

When potatoes and onions have softened, drain them and pour a thin layer of those into the dish

Add a layer of ham to top of the potatoes

Sprinkle with salt and pepper

Spoon half of the soup over the ham and potatoes

Cover with half of the shredded cheese

Repeat the layers once more

Bake at 350 degrees for about 30 minutes