Preheat oven to 350 F.
In a medium sized bowl, whisk together the bananas, eggs, coconut oil, honey and vanilla.
Mix in the almond flour, oat flour, baking powder, baking soda and cinnamon. Stir together until well combined.
Pour the batter into a parchment lined 9 x 5 loaf pan.
In a small bowl, mix together the cinnamon swirl ingredients until a paste forms. Drop spoonfuls on top of the batter, and swirl it into the bread with a toothpick.
Bake for 40 minutes, or until the edges start to brown and a toothpick comes out clean.
Let cool for 10-15 minutes. Mix the icing ingredients together until thick, and drizzle over the bread. Top with a sprinkle of cinnamon.
Keep refrigerated for 2 weeks, or store on the counter if your kitchen is cool for up to 1 week. Leftovers can be frozen for up to 3 months.