Gather all your ingredients in one place.
Peel and mash the ripe bananas in a large mixing bowl.
Add melted coconut oil to the mashed bananas and stir until smooth. Then add brown sugar, beaten egg, and vanilla extract, mixing until fully combined.
In a separate bowl, combine baking soda, salt, ground cinnamon, and gluten-free flour. Whisk until well mixed.
Gradually fold the dry ingredients into the wet mixture, being careful not to overmix.
Pour the batter into a prepared loaf pan and smooth the top.
Preheat the oven to 350°F. Bake for 50-60 minutes, checking for doneness with a toothpick.
Let the banana bread cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.