2 Tb butter
salt and pepper
1 Tb flour
3 medium potatoes peeled and sliced thin
1 1/2 cups milk
1 small onion minced
1/2 cup shredded cheddar cheese
a covered casserole dish
Recipe
Preheat the oven to 350 degrees F. Heat the butter until foaming add the minced onion. Cook until translucent. Then add the flour and cook about 30 seconds. Add the milk and heat and stir until thickened. Add the cheese and stir in.
Grease the casserole and add half the potato slices. Pour on half the sauce. Add the remaining potatoes and sauce. Bake covered for about an hour. Uncover and bake until browned.