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