Combine the dry ingredients in a blender or food processor. Add the apple juice and coconut oil and process until fully combined and mostly smooth.
Spread the batter out on a parchment lined cookie sheet until nice and thin - about 1/16 of an inch thick. Bake in a preheated 300 degree (F) oven for 15 minutes. Lower the heat to 250 degrees (F) and bake for another 10 minutes.
Remove from the oven and using a pizza cutter or knife, cut into squares about the size of the keys on your computer keyboard.
Turn off the oven and put the cereal back inside for about an hour, or until it is crisp and breaks easily. If still soft, keep in the oven until completely dried out and crisp.