Preheat oven to 350 °F and line a loaf pan with parchment paper and grease the inside of the pan to prevent sticking.
In a medium bowl, combine almond flour, coconut flour, baking soda, cinnamon and salt.
In a separate bowl, mash the bananas. Add in the butter or ghee, eggs, brown sugar and vanilla and whisk until fully combined.
Pour dry ingredients into wet ingredients and stir until just combined. If adding chocolate chips, fold those in.
Pour batter into parchment-lined pan. Smooth the top with a spatula.
Bake for 40-45 minutes, or until a toothpick inserted in the center comes out clean. Let cool for at least 30 minutes before removing them from the pans and serving.