Heat up half of the nut butter in the microwave until it is soft.
Mix with the remaining ingredients.
Place six cupcake liners in a cupcake tin.
Divide mixture evenly between liners, packing the mixture in tightly.
Add a tablespoon of water at a time to the remaining nut butter and mix completely. Keep adding until the nut butter is soft enough to pipe onto the chicken treat cupcakes.
Frost the cupcakes and top each one with a grape. I recommend slicing the grape into two so the chickens have no issues eating it.
Freeze (so that your chickens will have a nice cool treat).
When ready to serve, remove and thaw for a few minutes.
If your chickens are like mine, they might be a bit "chicken" at first and shy away from the cupcakes - but once they try them, they'll be happy!