Squash Made Cheesy

3 or 4 summer squash
1 onion, chopped
1 can cream of mushroom soup
1/2 small box Velveeta cheese, cubed
1/4 cup butter
Saltine crackers, crumbled (or suffing mix)

Slice and boil squash until tender; drain. Add onion, cheese and soup.
Pour into buttered casserole dish. Cover top with cracker crumbs and
drizzle butter over all. Bake at 350 degrees F for 30 minutes.