*I use Land O'Lakes White American Cheese, the slices that come unwrapped. The slices are thicker. You can also purchase a 4 oz. piece from your local grocery store deli, and just dice it before adding to the soup. The individually wrapped slices just aren't as good and are more expensive. And all that extra plastic adds to our landfills.
*I used 7 slices, but depending on what brand you use, it will be 6 - 8 slices.