From the kitchen of Vickie Stultz, Murfreesboro, Tennessee
In a saucepan, cook onion, corn and squash. Mix the remaining ingredients together in a large bowl. Combine mixtures and pour into a greased casserole dish.
Bake at 350° F for about 30 minutes or until cooked on sides. Place grated cheese on top. Place back in the oven until cheese is melted.