In a medium bowl, whisk together 6 tablespoons cornmeal, 2 tablespoons chili powder, 1 tablespoon ancho chili powder, 1 tablespoon chipotle chili powder, 2 tablespoons cumin, 2 tablespoons oregano, 2 tablespoons dried minced onion, 4 teaspoons garlic powder, 4 teaspoons sea salt, 2 teaspoons paprika, 2 teaspoons smoked paprika, and 1 teaspoon cocoa powder.