Preheat the oven to 400°F.
Brush an 8X8 baking dish with the melted butter. Add leftover stuffing to the bottom of the pan, squishing it down a little bit. Continue layering the pan with the cranberry sauce, shredded turkey, gravy and mashed potatoes. (Drizzle any leftover melted butter on the top of the potatoes to get them extra browned on top!) Place the dish on a cookie sheet in the oven and bake until the mashed potatoes are golden brown and the inside is heated through. Use the leftover crusty and corn bread to scoop into the dip. De-lish!