Golden Scalloped Potatoes

4 C potatoes, sliced thin

1 C cream of celery soup

1 small onion, sliced thin

1 C grated mild cheddar cheese

1/3 C milk

1 T butter

Mix milk with soup and onions, layer in 1-1/2 qt. casserole dish, with sliced potatoes, grated cheddar and dot with butter. Bake at 375 degrees for 1 hour covered and 15 minutes uncovered.