3 cheesy summer squash casserole Recipes

butter, divided, summer squash, trimmed and cut into bite-size pieces, zucchini, trimmed and cut into bite-size pieces, salt and ground black pepper to taste, onions, chopped, shredded sharp white cheddar cheese, shredded cheddar cheese, sweetened condensed milk, divided

vegetable oil, summer squash, thinly sliced, vidalia onion, thinly sliced, butter, grated fresh parmesan cheese, shredded sharp cheddar cheese, sour cream, salt & freshly ground black pepper, sleeve cracker, crushed medium to fine (recommended ritz)