Frozen Dog Treats

My wife makes all of the treats for our dogs. I believe she uses sweet potato, spinach, blueberries and oatmeal, and eggs. She rolls it out in a cookie sheet, about half to three quarters of an inch thick, then bakes. Once cooled, she cuts it into one inch squares and freezes it. Haven't met a dog yet that doesn't like them, we take a small zip lock bag with us to the dog park.