I've used both grated apple and organic, unsweetened apple sauce and both worked well. I've also used a little bit of powdered peanut butter. Instead of a cookie cutter, I rolled out between two sheets of waxed paper and cut it into small squares. My pup and the neighbors pups loved them!! I baked at 375 and turned them every 5 minutes so that they'd be more crunchy, cooked about 5 more mins than the recipe specifies. Be careful, they will burn if you do not watch them. Also, I found that it blended better if I whisked the egg, apple, pumpkin and peanut butter together before adding it to the ground oats.