Heat your oven to 180 degrees Celsius or 360 Fahrenheit.
Place all the seeds, salt, onion powder, and parmesan into a mixing bowl and stir to combine.
Add the water and mix to combine. Set aside for 15 to 20 minutes, during this time the chia and flax seeds will start to soften, gel and will bind all the ingredients together.
Tip out the seed cracker mix onto a baking paper-lined oven tray and spread out as thin as possible (around 3mm thick is ideal). I do this with a rubber spatula, or I lie a second piece of baking paper on top of the seed mix and gently roll out the mix with a rolling pin.
Bake for 30 minutes.
Remove from the oven and slice into crackers, then return to the oven to cook for another 15 minutes until crisp and golden. Remove to a rack to cool then store in an airtight container.
