This is an old fashioned, southern, squash casserole recipe. It's very easy to make and it's a great way to use up all that squash from the garden or farmer's market.
Preheat oven to 350 degrees. Thinly slice an onion and squash and put in a pot, cover with water a few dashes of salt. Bring to a boil and cook till tender. Drain and put in a medium-sized bowl. In a separate bowl melt butter and mix with stuffing. In the bowl with the squash and onions add egg, pepper, salt, 3/4 cup of the stuffing mixture and soup. Stir till combined. Spray a baking dish with non-stick spray. Sprinkle a little of the stuffing on the bottom of the baking dish, just enough to cover it, but don't make it too deep, you'll need the rest for the top. Pour squash mixture over the stuffing and top generously with the rest of the stuffing. Bake at 350 degrees for 30 minutes or until bubbly.