Combine the flaxseed meal, almond meal, cashew meal, hemp seeds and cinnamon in a food processor and process until well combined.
Add the coconut oil to the process and with it running, slowly add the orange juice until a smooth paste forms.
Line a baking sheet with parchment paper and spread the mixture out evenly into a rectangular shape so that it's about 1/16" thick. If you don't have an off-set spatula, I recommend putting the parchment on a non-rimmed baking sheet or using the back of a rimmed backing sheet to make it easier to spread with a spatula.
Bake for 15 minutes, then lower the temperature to 275 degrees and bake another 10 minutes.
Remove from oven, use a pizza cutter to cut into small squares.
Turn the oven off and return the baking sheet to the oven for 1-2 hours to dry out and crisp up.
Squares should break apart easily once dried.
Store in an airtight container or jar.
Notes
You can make both almond and cashew meal by simply grinding the nuts into a meal/flour consistency in your food processor. For the purpose of this recipe, it doesn't need to be super fine.