Preheat the oven to 350°F. In a plastic bag mix together the taco seasoning mix, cornstarch, cornmeal, chili, cumin and oregano. Add several wings to the bag and shake to give it a coating, repeat with the rest of the drumettes. Place the wings in a single layer on a greased baking sheet(s). Bake for approx 50 minutes, turning once or twice. Serve with ranch or blue cheese dressing.