01 - Preheat oven to 375°F and line a baking sheet with parchment paper.
02 - Whisk together flour, cornmeal, baking powder, chili powder, cumin, smoked paprika, garlic powder, onion powder, and salt in a large bowl.
03 - Add olive oil and water to the dry mixture. Mix until dough forms, adding additional water by teaspoon if too dry.
04 - Roll out dough on lightly floured surface to 1/8-inch thickness.
05 - Cut dough into 1-inch squares using knife or pizza cutter, or use small cookie cutter for shapes.
06 - Transfer crackers to prepared baking sheet. Sprinkle with shredded cheddar cheese and dried oregano if desired.
07 - Bake for 12-15 minutes until golden and crisp. Cool on baking sheet for 5 minutes before transferring to wire rack.
08 - Store in airtight container for up to one week.