Preheat your oven to 350°F (175°C). Do it now. Don’t “remember later.”
Brown the butter in a saucepan over medium heat. Stir until it smells nutty and turns golden-brown. Remove immediately—burnt butter is not charming.
Mash the bananas in a large bowl until mostly smooth. Some texture is fine.
Whisk in the brown butter, brown sugar, eggs, espresso, yogurt, and vanilla. It should look glossy and smell incredible already.
Add flour, baking soda, and salt. Stir gently. Overmixing kills the vibe.
Fold in add-ins if using. Chocolate + espresso = elite combo.
Pour batter into a greased loaf pan and smooth the top.
Bake for 55–65 minutes. Toothpick should come out mostly clean.
Cool before slicing. Cutting early leads to crumb regret.