This scrumptious Squash Casserole is a crowd-pleaser. Featuring sliced yellow squash, onions, and a cheesy sour cream sauce, this casserole is a comforting and flavorful addition to any meal. Topped with a crunchy layer of buttery Ritz crackers, it adds the perfect finishing touch to this irresistible dish. A sour cream squash casserole with Ritz crackers checks every box on your side dish list: It’s incredibly flavorful, layered with a tangy cheesy sauce, and has a crunchy Ritz cracker topping.