Two-Cheese Squash Casserole Ingredients 4 pounds yellow squash, sliced 4 tablespoons butter or margarine, divided 1 large sweet onion, finely chopped 2 garlic cloves, minced 2 1/2 cups soft breadcrumbs, divided 1 1/4 cups shredded Parmesan cheese, divided 1 cup (4 ounces) shredded Cheddar cheese 1/2 cup chopped fresh chives 1/2 cup minced fresh parsley