Don’t throw away those really ripe bananas. Put them in an air tight bag and store them in the freezer until you need them. When you’re ready to make another batch of treats, take it out of the freezer and let it defrost. Mushy bananas are much easier to work with when baking, and help bind the buckwheat flour to the rest of the ingredients.
The icing on the cookies is optional. I used Fido’s Frosting Greek Yogurt Royal Icing for Pets.