Mix the flour, baking soda, and baking powder in a bowl. In a separate bowl, mash bananas until smooth, add in melted and cooled coconut oil, beaten egg, maple syrup, coconut sugar, and vanilla. You can feel free to omit the 1/4 cup coconut sugar if you prefer a less sweet bread - it still comes out great. Mix the wet ingredients into the dry. Bake at 350 degrees for approximately 35 minutes or until a knife inserted in the center comes out clean.