Preheat the oven to 325 degree F. Lightly butter a 2-quart baking dish.
In a medium bowl, combine all of the ingredients. Spoon the mixture into the prepared baking dish. Bake until hot and bubbly, about 25 to 30 minutes. Remove the dish from the oven and top with the remaining cheese. Bake until the cheese is melted. Serve with tortilla chips.