Slow Cooker Ham and Scalloped Potatoes

1 cup water

½ teaspoon cream of tartar

5 potatoes, thinly sliced

1 cup chopped onion

salt and ground black pepper to taste

2 cups milk

¼ 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.