Preheat and prepare the pan

• Preheat the oven to 175 °C (350 °F).
• Grease a standard 9x5-inch loaf pan and line it with parchment paper. Set aside.

Brown the butter

• Add the butter to a saucepan over medium-high heat and let it melt and brown slightly.
• Remove from the heat, immediately pour into a large bowl and let it cool slightly.

Mix the dry ingredients

• In a medium bowl, whisk together the flour, baking soda, baking powder and salt. Set aside.

Combine the wet ingredients

• Once the brown butter has cooled slightly, add the mashed bananas, brown sugar, greek yogurt, eggs and vanilla.
• Whisk until well combined.

Fold in the dry ingredients and chocolate

• Add the dry mixture to the wet and fold with a wooden spoon or spatula until just combined, with no flour streaks remaining; do not overmix.
• Fold in the chocolate chips.

Fill the pan

• Pour the batter into the prepared loaf pan.
• Top with extra chocolate chips or chunks if desired.

Bake

• Bake at 175 °C (350 °F) until golden brown and a toothpick inserted in the middle comes out clean.

Cool and serve

• Let cool in the pan for 10-15 minutes.
• Remove from the pan and transfer to a serving plate or wire cooling rack.
• Slice and serve warm with butter and flaky sea salt, if desired.