Preheat the oven to 450°F. Mix together the flours, chopped herb, pepper, salt and sugar in a food processor, pulsing to thoroughly combine.
Add the olive oil, then slowly drizzle in the water while processing until dough starts to stick together.
Gently form dough into a ball and cut in half. Let both halves rest for about 10 minutes.
Lightly flour a work surface and roll out one half of the dough until very thin.
Cut into squares or rectangles with a sharp knife or pizza cutter, or into 1 1/2-inch rounds with a biscuit cutter.
Lay crackers out on a parchment-lined baking sheet. It’s okay to crowd them. Prick with a fork to keep from puffing up. Optional: brush with olive oil and sprinkle with flaked sea salt, garlic powder, or other toppings, if desired.
Bake for 12-15 minutes, or until crackers are starting to brown.
Transfer crackers to a wire rack to cool completely. Store in an airtight container up to 5 days.