Heat oven to 350 Deg F. Line a 9x5 loaf pan with parchment hanging over the long sides by a few inches. Clamp the paper down if you need to.
In a large mixing bowl mash the bananas then whisk in the sour cream, eggs and vanilla.
In another bowl, cream together the brown butter, honey and brown sugar until light and fluffy. Add to the banana mixture and stir until well combined. Wipe out the bowl the butter was in and weigh the flour then add the cinnamon, baking soda, baking powder and salt. Whisk together then add to the banana mixture, stirring with a spatula until no more streaks of flour remain.
Pour batter into prepared pan, removing the clamps and smooth out the batter. Optional - add the butter to a piping bag and pipe a line down the middle of the batter. This will get you that nice crack down the middle.
Bake the banana bread 50-60 minutes. About 10 minutes before the bread is done(around the 50 min mark), combine the honey and water and heat until bubbling, quickly brush over the top of the bread. Keep baking until a skewered poked into the middle comes out clean and the bread bounces back lightly. As soon as the bread is out of the oven brush with remaining honey glaze
Let the bread cool in the pan for 15-20 minutes then carefully remove to a wire cooling rack to cool completely.
Keep in an airtight container or wrapped in foil at room temperature up to a week.