Smoky Potato Skillet Casserole

1 package (16 oz) smoked sausage links, cut into 1-inch pieces
2 celery ribs, chopped
1 medium onion, chopped
1 tbls. butter
2 cups water
2/3 cup milk
1 package (5-1/4 oz) au gratin potatoes

IN a large skillet, saute the sausage, celery and onion in butter until vegetables are tender. Stir in water, milk, and sauce mix from potato package; bring to a boil.

STIR in potatoes. Reduce heat; cover and simmer for 20-25 minutes or until potatoes are tender, stirring once.

I sprinkle shredded cheese on top for extra cheesiness.