These mashed potato cakes are so delicious, you will want to make mashed potatoes just to make the potato cakes. Potato cakes is by far the best way to use up leftover mashed potatoes and ham. Ham, cheese, and chives is a great flavor addition for these potato cakes and it's easily made within 30 minutes. Cook mashed potato cakes in a non-stick pan with minimal oil to create a beautiful crunch on the outside while still soft and smooth on the inside.