Preheat oven to 375° F. Prepare a 9 x 9 loaf pan with nonstick baking spray.
In large bowl, combine tapioca flour, cornmeal, brown rice flour, cornstarch, sugar, baking powder, baking soda, and sea salt. Whisk well to combine.
Transfer mixture into prepared loaf pan. Bake for 35-40 minutes or until golden brown. Enjoy.