Easy Au Gratin Potatoes
The secret is to use a starchier potato, like Russets or Bakers. Also slice potatoes as thin as you can.
1/4 cup each flour and butter
1-1/2 teaspoons salt
1/2 teaspoon pepper
2 cups milk or half & half
1 generous cup shredded cheddar cheese
5 cups thinly sliced peeled potatoes
1/2 small onion, diced fine
Preheat oven to 350. In a large saucepan, melt butter over low heat. Stir in flour, salt and pepper until smooth. Gradually add milk. Bring to a boil; cook and stir 2 minutes or until thickened. Remove from heat; stir in cheese until melted. Add potatoes and onion.
Transfer to a greased 2-qt. baking dish. Cover and bake 1 hour. Uncover; bake 20 minutes or until the potatoes are tender.