Preheat the oven to 180ºC/350ºF and line a small baking sheet with parchment paper.
In a large bowl, combine chia seeds and warm water and allow to sit for about 5 minutes.
Slowly add the flours until well incorporated.
Combine sugar, oil, ginger, cinammon and mix thoroughly.
With your hands create little balls with the dough and place them in the baking tray.
Use your thumb to press in the dough and make a little hole halfway into the cookie.
Bake for 20 minute.
While the cookies are still hot, fill them in with peanut butter, in order for the butter to melt.
Sprinkle with cinnamon and/or shredded coconut (optional)