Mix the coconut sugar and cinnamon together in a small cup. Set aside.

Pour the flours into a large bowl. Add in the butter, and cut it into the flour mixture using your hands, or a pastry cutter (alternatively, you could do this step in a food processor). Mix it until it becomes crumbly.

Now, pour in the vanilla and the water a little at a time, and mix with a spoon or fork until a dough forms. You may not need all of the water.

Flatten the dough into a disc, and wrap it in plastic wrap. Store in the fridge for 30 minutes.

Meanwhile, preheat the oven to 350 F.

Roll out the dough on top of a sheet of parchment paper until it's thin. Sprinkle the cinnamon-sugar on top of the dough, being sure to press it in.

Using a pizza cutter, slice the dough into small squares. Separate the squares so they're not touching (this will help them bake evenly).

Slide the parchment paper onto a baking sheet, and bake for 18-20 minutes, until the cereal is slightly darker in color.

Remove from the oven and allow to cool completely. Eat the cereal alone or in a bowl with milk!