Cook the grits in salted water following package directions.
Preheat oven to 325°. Grease a 1 1/2 to 2-quart baking dish.
Stir the butter and cheeses into the grits. Whisk eggs with the milk and stir into the grits mixture. Turn into the prepared baking dish and bake for about 45 minutes, or until set.
Calories per serving: 336