In a large mixing bowl mix all ingredients except crushed cracker crumbs and melted butter. Spoon potatoe mixture into a lightly greased 3 quart casserole dish. Sprinkle crushed cracker crumbs over the top of potatoes, drizzle with melted butter. Cover with aluminum foil. Bake at 325 for 1 hour and 15 minutes. Remove cover, bake an additional 45 minutes