My mother-in-law's Squash Casserole is awesome. It's a delicious, creamy way to get everyone to eat squash.
Sauté the onion and squash in a little olive oil until the onions are translucent.
Combine squash with mayonnaise, cheese, eggs, salt and pepper.
Pour into a greased casserole dish.
Melt butter and mix with bread crumbs (or cornflake crumbs, for gluten-free) until crumbly.
Sprinkle on top of casserole.
Bake 30 minutes at 350 degrees or until the custard sets.