Preheat oven to 350°.
Grease an 8x8 pan. I like to put a bit of coconut oil on a paper towel and spread it along the entire surface area of the pan. This helps keep the bars from sticking when you are ready to serve. You can also use spray oil as well.
Sift together and set aside flours, baking powder, and cinnamon.
In a mixing bowl combine coconut oil, maple syrup, vanilla, and bananas. Mix until well incorporated.
Add flour mixture to the banana mixture. Mix well.
Stir in chopped walnuts (if desired).
Spread batter into prepared pan. It will be thick. Try to spread it out as evenly as possible.
Bake 20-25 minutes.
Cut into bars. Make 3 cuts in one direction and 2 cuts in the other direction to make 12 bars. These can also be cut into 9 bars for a larger size (as shown in the photo.) Enjoy!