Preheat oven to 350F and grease a 9x5 loaf pan with butter or avocado oil.
Add the banana to a loaf pan and mash well. Whisk in the eggs, almond butter and maple syrup. Then whisk in the almond flour, baking powder and salt until combined. Whisk together the cinnamon sugar then sprinkle on top of the batter and lightly swirl into the top of the batter.
Bake for 26-32 minutes until edges are golden and a toothpick inserted into the center comes out mostly clean. Run a knife around the edges to loosen, then let cool for 15 minutes before removing from the pan.
Whisk all ingredients for the icing until smooth. Once the loaf is cooled, drizzle the icing on top and let harden for 1-2 minutes before slicing.
