Preheat the oven to 180C/350F. Line a large baking sheet with parchment paper.
Add the almond flour, cheddar, parmesan, salt, and garlic powder (if using) , to a food processor and blend well, until it forms a dough. If the dough is too crumbly or isn’t coming together, microwave the mixture for 20-30 seconds to allow the cheese to melt, then return it back to the blender and blend. The dough might stay a bit crumbly, but it must stick together if you pinch it with your fingers.
Transfer the dough to a bowl, add your desired herb(s) if using, and knead well with a spatula or wooden spoon.
Place the dough onto a piece of parchment paper, and fold it over the dough. Use a rolling pin to roll out the dough into about ¼ inch thick.
Cut the dough into even squares with a pizza cutter and then sprinkle with flakey salt on top.
Bake for 10-12 minutes, or until golden around the edges.
Remove from the oven and allow to cool completely.
Store crackers in an airtight container at room temperature.