Preheat oven to 160°C (320°F). Line a baking tray with parchment paper.
Mix dry ingredients in a large bowl.
½ cup ground flaxseed, ½ cup whole flaxseed, ¼ cup chia seeds, ½ cup sunflower seeds, ½ cup sesame seeds, 1 ½ tsp dried oregano or rosemary, ½ tsp sea salt
Add water and stir until thickened into a gel-like dough. Let sit 10 minutes.
1 ½ cups water
Spread evenly on the tray, smoothing with a spatula to about 3–4 mm thick.
Score crackers with a knife to your desired size.
Bake for 30–35 minutes, flipping halfway through if needed.
Cool completely, then break apart and store in an airtight container.