A little late on this one, but I love this recipe:

SQUASH CASSEROLE

** I double this recipe for a party and use a 9 X 13 size dish**

1 lb summer squash, sliced
1 medium onion, chopped (Vidalia or other sweet onion is great in this)
¼ tsp salt
¼ cup butter, melted
1/8 tsp pepper
1 TBSP sugar
2 eggs, beaten
¼ tsp soy sauce
¾ cup grated cheddar, divided
½ cup cracker or bread crumbs, divided
1/8 tsp paprika


Grease 1 ½ quart casserole. Cook squash, onion, salt on stove top until very soft. Add to butter, pepper, sugar, eggs, soy sauce, grated cheddar (1/4 cup) and ¼ cup bread crumbs. Bake 20 minutes. Top with rest of cheddar, rest of bread crumbs and paprika. Bake 10-15 minutes more.

... Looking at the recipe, I don't think I always use the sugar when I use Vidalia onions- they are so sweet. I don't remember putting sugar in the last few times!