Add almonds and flax seeds to a blender, and pulse until a coarse flour is formed. Be careful not to blend for too long and turn the almonds into almond butter. Larger pieces will make it more difficult to roll the dough out flat – so it’s a balance!
Add the almond and flax flour to a bowl, along with water, salt, and chopped rosemary. Use a micro planer to grate garlic into the bowl.
Fold a large sheet of parchment paper in half, large enough to cover a 1/2 sheet pan. Preheat oven to 325º F.
Add the almond and flax seed dough to the folded piece of parchment paper. Use a rolling pin to roll it out into a very thin layer. It should take up almond the whole sheet pan, approximately 10″ x 12″.
Remove the top layer of parchment paper and cut it off. Use a pizza cutter or large knife to cut the cracker dough into 1 inch squares. Sprinkle the tops of the crackers with flaky sea salt, if desired.
Slide the crackers with parchment paper onto the baking pan. Bake the crackers for 22-24 minutes. Once they are slightly golden around the edges, turn the oven off and allow heat to escape. Leave the crackers in the oven while the oven cools down.
Once the crackers have cooled to room temperature, break them into squares. Enjoy as is, or use for cheese, or alongside soups!