Scalloped Potato Casserole - cooking recipe

Ingredients

3 Tbsp. butter
2 Tbsp. all-purpose flour
3 c. milk
6 medium potatoes, pared and thinly sliced
1/2 tsp. black pepper
1 1/2 tsp. salt
2 Tbsp. chopped onion

Preparation

Make white sauce with first 4 ingredients and pepper.
Place half of potatoes in 2-quart casserole dish, cover with 1/2 of the onions and then 1/2 of the sauce.
Repeat layers.
Cover and bake at 350\u00b0 about 1 hour.
Uncover and bake 30 minutes longer.