To prepare a yellow squash casserole casseroles recipe, you will first need to prepare your ingredients. You will need: 1 1/2 cups sourdough bread, 1 cup shredded cheddar cheese, 2 tablespoons melted butter, and 1 teaspoon kosher salt. Preheat the oven to 350 degrees F (177 degrees C) and grease 2 8-inch round baking pans with nonstick cooking spray. Cut the squash in half lengthwise and scoop out the seeds. Place the flesh side down on the prepared baking sheets. Bake in the preheated oven for 20 to 25 minutes or until squash is tender. Remove from oven and allow to cool for 5 minutes before serving.