My friend had a small “business” making and selling horse treats locally. She used sprinkles, flour, and other natural ingredients and didn’t have any problems. However, th sprinkles she used were pure sugar with a little bit of wax to maintain freshness and prevent sticking. Another good ingredient as opposed to typical white flour is oat flour. Also really nice to stick peppermints on them! Hope this helps
I'm not sure about cinnamon, powdered sugar, sprinkles. Like Kessy said, I try to stick with more natural ingredients. Here is the link to the treats I always make: http://myhorseforum.com/threads/how-to-make-a-birthday-cake-for-your-horse.318671/
Instead of a cake, I do small treats. They are much easier to feed separately and stay fresh longer. The horses have never had a problem with this recipe and I've used it for years! Even my super picky mare loves them!
When I make horse treats, I always follow a recipe to make sure it is safe.
Flour is used in many industrial recipes, I am not sure about cinnamon, powdered sugar and sprinkles. I advise you to stay very natural with horse treats: carrots, honey, apple, barley...
Also the cooking spray I used had canola oil in it also