I tried avocado bread recently when a loaf was gifted to me. I came up with this recipe which is dense and moist. Made with Swerve® and without the addition of butter, oils, or any other fats for a 'healthier' bread. I did not tell the family the 'secret' ingredient and they all thought it was banana nut bread!
Haas avocados are richer than regular avocados and used in this recipe for the natural fats they contain.
White sugar can be used instead of the sweetener, but the calorie count will certainly change.