Preheat your oven to 160c and grease and line a 9×5 inch loaf pan with parchment paper.
Begin by browning your butter by melting the butter in a pan over medium heat. It will go from melted to then bubbling loudly before going quiet and foamy. Keep stirring until it turns a light amber colour overall but the flecks are dark dark brown, and you can smell chestnuts. (Scroll up for helpful images on this process)
Once browned, pour into a bowl to cool down.
In a bowl, whisk together the melted brown butter and sugars for a minute until thick.
Add in your mashed bananas, eggs, yoghurt, and vanilla.
Once all of your wet ingredients are mixed together, gently stir in the flour, bicarb and salt. Then, fold in the chocolate chips.
Pour the batter into your prepared loaf pan. Slice the extra banana in half lengthways and lay with the cut side up. Sprinkle extra chocolate chips on top if you like.
Bake for 1 hour to 1 hour 15 minutes or until a skewer comes out with a few moist crumbs. Let it cool completely before removing from the pan. Store at room temperature in an air-tight container.