Preheat oven 400 degrees. In a large bowl, mix together the mashed banana, coconut oil, maple syrup, almond milk, and vanilla extract. Stir until smooth and well combined.
Add in flour, cinnamon, baking powder, and salt and mix well. Do NOT overmix! Simply stir until moist.
In a smaller bowl, mix together cinnamon swirl ingredients.
Line a loaf pan with parchment paper and spray with cooking spray. Add about half the batter to your pan then half the cinnamon roll batter (NOTE: The batter is very thick! When you add the cinnamon swirl to the middle and top layer of the batter, you're able to spread it out.)
Add the rest of the batter followed by the cinnamon roll mixture and swirl again.
Bake in the oven for 40-50 minutes, covering with foil halfway through to avoid burning edges. Bake until a toothpick comes out clean.
Allow to cool completely before removing, slicing, and serving.