Preheat the oven to 350°F (180°C) and coat a 9-inch loaf pan with non-stick spray.
Using either an electric hand mixer or a stand mixer, blend the melted butter and brown sugar together. Incorporate the vanilla, eggs, and mashed banana.
1/2 cup (111g) salted butter, melted , 1 cup (246g) brown sugar + extra for topping , 1 tbsp vanilla , 2 eggs, 2 cups (450g) mashed bananas
Gradually add the flour, baking soda, and salt to the wet mixture, mixing until just combined. Be careful not to overmix.
2 cups (304g) all-purpose flour, 1 tsp baking soda , 1 tsp salt
Pour the batter into the prepared loaf pan. Sprinkle the top of the banana bread with extra brown sugar.
Bake at 350°F for 55-60 minutes, ensuring it passes the toothpick test before removing from the oven.
Allow the bread to cool slightly or completely before slicing, depending on your preference.