Mix peanut butter, water, and vanilla until combined.
Add salt and cinnamon. Mix well.
Add rice protein. Mix well.
If the batter is too sticky (sticks to your fingers), add a little more protein powder.
Form the batter into 12 balls, and place onto parchment-lined cookie sheet. (If dehydrating, place directly on the mesh dehydrator sheets.)
Using a fork, flatten each ball with a criss-cross pattern.
Bake for 20-25 minutes. (Or dehydrate at 115F for 12-14 hours.)
Enjoy!
Notes
A note about substitutions: In this recipe, you might try substituting vanilla pea protein powder for the vanilla rice protein powder. Using whey would give it a very different (probably undesirable) texture.