I got this off one of my Facebook friends. It looks so good.
1 1/2 cps grated swiss cheese
1 lrg. bag of sour cream & onion chips ( crushed)
1 can cream of mushroom soup mixed with equal part of milk
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Slice onions thinly and layer onions, crushed chips. and swiss cheese...for 3 complete layers in a greased 9x13 casserole dish.
Pour soup mixure over top. Bake at 350 degrees uncovered for 1 hr to 1 1/4 hrs. :-D
(Thanks to Ms. Cheryl! I have another of her yummy recipe to share later)