01 - Preheat oven to 375°F. Line baking sheet with parchment paper.
02 - In large bowl, whisk together flour, cornmeal, baking powder, chili powder, cumin, smoked paprika, garlic powder, onion powder, and salt until thoroughly blended.
03 - Add olive oil and water to dry mixture. Mix until dough forms. Add additional water teaspoon by teaspoon if dough appears too dry or crumbly.
04 - On lightly floured surface, roll dough to 1/8-inch thickness. Ensure even thickness for uniform baking.
05 - Using knife or pizza cutter, slice dough into 1-inch squares. Alternatively, use small cookie cutter for custom 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 edges turn golden brown and crackers feel firm to touch. Let cool on baking sheet for 5 minutes.
08 - Transfer crackers to wire rack to cool completely. Store in airtight container up to one week.