- 1 cup water
- 1/2 teaspoon cream of tartar
- 5 potatoes, thinly sliced
- 1 cup chopped onion
- salt and ground black pepper to taste
- 2 cups milk
- 1/4 cup all-purpose flour
- 1 cup shredded Cheddar cheese
- 2 cups cubed smoke ham
- 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.