Root Vegetable Gratin Ingredients 2 Sweet Potatoes, peeled and sliced 1/4” thick 2 Russet Potatoes, peeled and sliced 1/4” thick 1 Rutabaga or Celery Root, peeled and sliced 1/4 “ thick 1/2 cup all-purpose flour 1 1/4 cup Parmesan Cheese, divided 2 cups half and half 1 Thai Chili, minced, or 2 teaspoons Red Chile