Old School Squash Casserole - a must for your holiday table!!! Loaded with 3 types of cheeses - cheddar, Swiss and parmesan. Seriously delicious! Squash, onion, butter, eggs, sour cream, mayonnaise, cheddar, swiss, thyme, salt, pepper, crushed Ritz crackers and parmesan. Can make ahead of time and refrigerate overnight. SO easy and SO delicious! Everyone LOVES this yummy side dish. #casserole #squash #sidedish #thanksgiving #christmas