- Preheat oven to 350 degrees F. Spray a 9x13x2 baking dish with a non-vegetable spray (Pam). Set aside. In a small saucepan, simmer squash and onions in water until tender.
- In a large mixing bowl, mix melted butter with dressing, reserving 1/2 cup of dressing for top of casserole. Drain squash and onions thoroughly and add to the stuffing mix. Add remaining ingredients and put in a 9x13x2 baking dish. Sprinkle with reserved stuffing. Bake for 45 minutes, or until hot and bubbly.