zucchini gratin casserole

Description Delicious layers of cheese, onion and zucchini with a buttery bread crumb topping your family will love! Ingredients 6 tablespoons butter 1 onion, chopped 2 pounds zucchini, cut into 1/4-inch slices 2 teaspoons kosher salt 1 teaspoon freshly ground black pepper 1 teaspoon chopped fresh parsley 2 tablespoons all-purpose flour 1 cup hot milk … Read more