Preheat the oven to 350°F. Line a 1-pound (8 ½ x 4 ½-inch) loaf pan with parchment paper, letting it fold over the sides for easier removal.
Melt the coconut oil (either using a small pot or in the microwave).
In a large mixing bowl, mash up the banana with a fork.
Add the coconut oil, dark brown sugar, cane sugar, and pumpkin to the bowl with the banana.
Mix on low using a hand mixer until the sugar and coconut oil is combined, you may still see chunks of bananas, that’s okay.
Add the coconut milk and dry ingredients: flour, pumpkin spice, baking powder, and sea salt.
Mix together until combined into a smooth batter.
Transfer the batter to the prepared baking pan and spread evenly. Using a butter knife, make a slit down the middle (this helps give it that perfect crack when baked!)
Bake for 1 hour and 15 minutes, or until a toothpick inserted in the center comes out clean. Allow to cool completely in the baking pan.