Servings: 4

Slow Cooked Au Gratin Potatoes
5 – 6 medium potatoes, peeled and sliced 1/4 “ thick
1/2 cup onion, minced
3 Tbl. butter
3 Tbl. flour
2 cups milk
4 oz. smoked gouda, shredded
4 oz. sharp cheddar, shredded
3 Tbl. parmesan cheese, grated