Scalloped Potatoes

6 med potatoes
1 medium onion, diced.
6 T margarine
6 T flour
2 C milk
1 t salt (or more to taste)
Add diced ham to make it a meal

In a sauce pan, melt margarine.  Add flour and stir together.  Once combined, add milk and salt and whisk.  Keep on low-med heat, stirring constantly to keep from scorching. Once mixture has thickened, add to potatoes.  If cooking in the crock pot, boil potatoes and onions together before combining with the sauce and putting into the crock pot.  Sprinkle with pepper and cook on low for 2-4 hours. If baking in the oven, you don't need to pre-cook potatoes.  Place raw potatoes, onion, sauce and optional ham into baking dish, sprinkle with pepper, and bake at 350 for 1-1/2 hours.

I made an extra half recipe of the white sauce for mine last time.  I like it extra creamy.