preheat the oven to 325 and line a baking sheet with a silpat mat
use a small electric coffee grinder to blend the oats and flax seeds into a fine flour
combine the oat flour, flax meal, almond meal, coconut sugar, cinnamon and salt in a large bowl. Create a small well in the center
into the well, pour in the aquafaba, vanilla, and 3 tablespoons of water. Use your hands to mix until a dough forms. *If it’s still too dry and crumbly, add in extra water until the dough can be shaped into a malleable ball
tear off two pieces of parchment paper. Place the first piece on the counter. Roll the dough into a ¼ rectangle directly on top of the first piece of parchment paper, using the second piece of parchment paper on top as a barrier between the rolling pin and the dough
combine the white sugar and remaining 2 tablespoons of cinnamon. Brush the aquafaba over the dough, then sprinkle the cinnamon sugar mixture on top
use a pizza cutter to slice the dough into small 1” x 1” squares
transfer the squares to the baking sheet. You can either use a spatula or lift the bottom piece of parchment paper to “flip” the squares off and over. Whichever method you choose, be sure to spread the cereal squares out as much as possible on the baking sheet
bake the squares at 325 for 20 minutes, then rotate the baking tray and bake for another 10 minutes. Let cool completely before transferring to an airtight storage container