- 2 tbsp butter
- 3 tbsp flour
- 1 tsp salt
- 1/4 tsp pepper
- 1 1/2 cups milk
- 1/2 cup shredded cheese
- 1 3/4 lbs peeled and thinly sliced (~5 medium potatoes)
- 1 medium onion, halved and thinly sliced
Preheat oven to 350.
In a small pan, melt butter. Stir in flour, salt, and pepper until smooth; gradually add milk. Bring to a boil. Cook and stir for 2 minutes (or until thickened). Remove from heat; stir in cheese until blended.
Place half of potatoes into greased baking dish; layer with half the onion and cheese sauce. Repeat layers.
Cover and bake at 350 for 50 minutes. Uncover; bake 10-15 minutes longer, or until bubbly.