Cover and cook on"Low" 6 … https://www.tasteofhome.com/recipes/scalloped-potatoes-and-ham Make a roux with butter, flour, and 1 teaspoons salt. https://www.recipesthatcrock.com/country-style-scalloped-potatoes-crock-pot Slowly add milk, then cheese. Cook over low heat until thickened. https://www.tasteofhome.com/recipes/creamy-mushroom-ham-potatoes Pour over potato/ham mixture in crock pot, and gently stir. https://www.allrecipes.com/recipe/18346/baked-scalloped-potatoes Layer potatoes, onion, 1 teaspoons salt, and ham (if used) into crock pot. https://www.allrecipes.com/recipe/240085/scalloped-potatoes-au-gratin