Slow Cooker Ham and Scalloped Potatoes Recipe

Mix water and cream of tartar in a large bowl.

Stir potatoes into water mixture until potatoes are well coated; drain.

Layer potatoes and onion in a slow cooker; season with salt and black pepper.

Heat milk and flour in a saucepan over medium heat stirring often until boiling about 5 minutes; season with salt and black pepper.

Pour about half the milk sauce over the potato mixture.

Scatter Cheddar cheese and ham into the slow cooker; cover with remaining milk sauce.

Cook on Low setting for 9 to 10 hours or on High for 4 1/2 to 5 hours.