Preheat oven to 350 degrees fahrenheit. Grease a 10 or 12 inch cast iron skillet with oil, and set aside.
Combine the buckwheat flour, sorghum flour, baking powder, baking soda, cinnamon, and flaxseed meal in a mixing bowl. Combine well with a fork or whisk.
Add the maple syrup, avocado oil, vanilla extract, and sparkling water to the dry ingredients. Stir well to combine, then add bananas and mash into mixture with a fork or potato masher.
Sir in chopped pecans if desired, and pour the batter into skillet.
Bake in the oven for 30 minutes or until the top is lightly browned. Remove from the oven and cool on a wire rack for 5 minutes before slicing into 8 wedges and serving.
Store leftover banana bread in an airtight container at room temperature for up to three days.
Video
Notes
Ingredient Substitutions & Additions:
I use buckwheat and sorghum flour. You can also use whatever gluten-free flour you have on hand, such as brown rice, oats, quinoa, etc.
Try a "chia egg" instead of the flax egg, or use a regular egg if you don't want a vegan version.
Sparling water can be replaced with your plant-based milk of choice.
If desired, swap honey for maple syrup. I haven't tried this with Swerve or monk fruit calorie sweeteners. If you try either of these, let me know!