Preheat oven to 325. Oil pans. Combine syrup, vanilla, mashed banana, water, and oil. Mix well with spoon by hand or with an electric mixer on low. Add baking powder and mix well. Add oat, potato starch and rice flours and mix well.
Divide batter equally between two pans. Bake for 70 minutes or until inserted toothpick comes our clean.
Corn Substitutions: Corn is a common ingredient in products. Starch, modified food starch, dextrin and maltodextrin can be from corn. Consult with your physician to find out which corn derivatives you need to avoid. Many corn-free options are available in the US. Find out more about corn substitutions.
Gluten: Gluten is a protein found in specific grains (wheat, spelt, kamut, barley, rye). Other grains are naturally gluten-free but may have cross-contact with gluten-containing grains. Look for certified gluten-free products if you need to avoid gluten. Find out more about wheat and gluten substitutions.