6 oz. packaged stuffing mix (like Pepperidge Farm; any flavor)
1 c. sour cream
1 medium onion, diced
3 to 4 yellow squash, sliced
1/2 stick butter
1 can cream of chicken or cream of celery or cream of mushroom soup

Boil squash and onion until tender. Drain. Mix with other ingredients. Save approximately 1/2 cup stuffing mix for topping. Mix well and place in a greased casserole dish. Top with reserved stuffing mix.

Bake for about 30 minutes at 350°F.