preheat oven to 350

peel and slice potatoes, approx 1/4" thick

in a greased casserole dish, layer potatoes and onion

in a separate bowl, combine soup, dressing and sour cream

pour mixture over potato and onion layers

sprinkle cheese on top

cover and bake for 90 minutes

Note: I combined Kraft Swiss Au Gratin cheese and Kraft Habanero heat pizza mozzerella evenly. I found this gave it some nice kick