Preheat oven to 350°F (177°C). Line a baking sheet with parchment paper or a silicone mat.
Mix dry ingredients in a bowl: oat flour, flaxseed meal, salt, oregano, and rosemary.
Add wet ingredients: olive oil, apple cider vinegar, egg white, and water.
Mix until a soft dough forms. It should be pliable, not sticky. Let the dough rest 5 minutes to allow the flax to absorb moisture.
Roll the dough between two sheets of parchment until very thin — about the thickness of a coin.
Score into cracker shapes using a knife or pizza cutter.
Bake for 25 minutes, rotating the pan halfway through if needed, so they cook evenly.
Cool completely in the pan. The crackers will crisp up more as they cool.
Video
Notes
-*To make these vegan, replace the egg white with a chia or flax egg: mix 1 tablespoon chia seeds or ground flaxseed with 3 tablespoons of water and let sit for 5 minutes to gel.