This side dish is a great accompaniment–no matter what your main dish is for the Christmas Holiday.  This is another Gluten-Free recipe contributed by John Piscatello.  Again, thank you John for your contribution. Sweet Potato Casserole 6 to 8 Cups of mashed sweet potatoes (5 to 6 medium sweet potatoes, peeled, sliced thick and boiled until tender. Drain and mash with a potato masher. Canned Sweet Potatoes can be substituted.) 3/4 Cup of Butter (1 1/2 sticks) melted or very…