Preheat the oven to 350 F
Add the eggs, mashed bananas, oil, sugar and vanilla to a bowl and whisk well.
In a small bowl combine the almond flour, tapioca flour, cinnamon, baking soda, baking powder and pinch of salt and mix together. Pour the dry ingredients into the wet and whisk well until evenly incorporated.
In a microwave safe dish, melt 1 tbsp of butter. Once melted add in 1 tbsp of coconut sugar and a pinch of cinnamon and mix well.
Line a 9 x 5 loaf pan with parchment paper and pour 3/4 of the banana bread batter into the pan.
Pour the cinnamon sugar mixture over the center of the loaf and swirl into the batter using a toothpick or knife.
Pour the remaining banana bread batter over the top.
Bake for about 35 minutes, until the top if firm to touch. *A glass baking dish may require a longer bake time
Let cool completely and slice. Store in a cool, dry place for up to 4 days or refrigerate for up to 1 week.