Preheat oven to 325 degrees F. Prep a loaf pan (or muffin tin) by spraying with non-stick spray, buttering or using parchment paper.
In a large bowl, combine the melted butter and smashed bananas. Using a wooden spoon or whisk, mix well until there are minimal lumps--it should be fairly smooth. Add the egg and stir to combine. (some small lumps are okay). sugar, flour, baking soda and salt. Set aside.
Add the sugar to the bowl. Mix well before adding the flour, baking soda and salt. Stir until everything is combined, being sure not to over mix your batter, then tip in any add-ins you are using (chocolate chips, dried fruits, nuts, ect...) and stir gently until they are evenly incorporated.
Pour your batter into the prepared/greased loaf pan (or muffin tins). Top the batter with some raw sugar crystals, if using.
Bake for 45 minutes to 1 hour or until a toothpick can be inserted in the center and come out clean, without batter on it.
Remove the bread from the oven and let cool a couple minutes before cafefully removing from the pan. Let the bread cool on a rack for about a half hour or so before cutting into it. If you are impatient and can't wait--that's okay, too! Your bread may be a bit soft though and is more likely to fall apart.