1 medium onion, chopped
2 tbsp butter
1 tbsp flour
1 tsp salt
1/4 tsp pepper
2 cups half and half
2 cups shredded cheddar cheese
6 medium potatoes, sliced
1/4 cup fine dry bread crumbs
Layer in casserole dish. Top with bread crumbs. Bake 1 to 1 1/2 hours at 350'.