Brown Butter Banana Bread with Molten Chocolate Step-by-step instructions

Before you start

Before starting, gather all ingredients and let the egg and sour cream come to room temperature for about 30 minutes—this helps them blend more smoothly into the batter. Preheat the oven to 350°F (175°C) and line a 9x5-inch loaf pan with parchment paper, leaving some overhang for easy removal.

Measure out the flour, baking soda, and salt, and whisk them together in a medium bowl. Have the mashed bananas ready, and chop the chocolate if using a bar instead of chips.

Instructions

Brown Butter and Wet Mix

1. 1Brown the Butter
   Melt the butter in a small saucepan over medium heat. Continue cooking, swirling the pan occasionally, until the butter foams, then turns deep amber brown and gives off a nutty aroma. Remove from heat and let cool slightly.
   Look for The butter will foam, then the milk solids will sink and turn golden brown. Watch for a nutty smell and a deep amber color.
   Tip Keep a close eye on the butter once it starts to foam—it can go from browned to burnt quickly. Remove from heat as soon as it smells nutty.
2. 2Mix Wet Ingredients
   In a large bowl, whisk together the mashed bananas, granulated sugar, brown sugar, egg, vanilla bean paste, and sour cream until smooth and well combined. Pour in the slightly cooled brown butter and whisk until fully incorporated.
   Look for The mixture will look glossy and well combined, with no streaks of butter or sugar.
   Tip If the brown butter is too hot, it could cook the egg. Let it cool for a few minutes before adding.

The butter should be a deep amber color with a nutty aroma, and the wet mixture should be smooth and glossy.

The brown butter will have darkened and released its fragrance, while the bananas and sugars create a thick, fragrant base. The egg and sour cream should be fully incorporated, with no streaks remaining.

Combine and Bake

3. 3Combine Dry Ingredients
   In a separate bowl, whisk together the flour, baking soda, and salt. Add the dry ingredients to the wet mixture and fold gently with a rubber spatula until just combined. Fold in the chocolate chips, reserving a handful for the top.
   Look for The batter will be thick and slightly lumpy—do not overmix. You should see streaks of flour disappear but still have some lumps.
   Tip Overmixing develops gluten and can make the bread tough. Fold just until there are no dry spots.
4. 4Fill the Pan
   Pour the batter into a parchment-lined 9x5-inch loaf pan. Smooth the top with a spatula, then sprinkle the reserved chocolate chips over the surface.
   Look for The batter will fill the pan about three-quarters full. The top will be level, with chocolate chips scattered over.
   Tip Line the pan with parchment paper so the loaf lifts out easily after baking.
5. 5Bake the Bread
   Place the pan in a 350°F (175°C) oven. Bake for 55 minutes, until the top is cracked, deep golden brown, and a toothpick inserted into the center comes out mostly clean with a few moist crumbs.
   Look for The top will crack and the edges will pull away from the pan slightly. The kitchen will smell of bananas and toasted butter.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip If the top browns too quickly, tent loosely with foil for the last 15 minutes.

The batter should be thick and just mixed, with no dry flour visible. The loaf pan will be about three-quarters full, and the top will be scattered with chocolate chips. As it bakes, the top will crack and turn golden brown, and the kitchen will fill with the inviting scent of banana and toasted butter.

Cool and Slice

6. 6Cool and Serve
   Let the bread cool in the pan on a wire rack for 10 minutes. Then lift it out using the parchment paper and let it cool completely on the rack before slicing. Serve warm for molten chocolate pockets.
   Look for The bread will feel firm but spring back when pressed. The chocolate chips on top will be set but still soft inside.
   Tip For cleaner slices, use a serrated knife and wipe it between cuts.

After cooling for 10 minutes, the bread should be firm enough to lift out of the pan. The top will be deeply browned, and a toothpick inserted will come out with a few moist crumbs. When sliced, the interior should be tender and moist, with visible chocolate pockets that are molten if served warm.

Common mistakes

A common mistake is overmixing the batter, which develops gluten and results in a dense, tough loaf. Mix just until the flour is incorporated, leaving some lumps. Another pitfall is overbaking, which dries out the bread.

Start checking for doneness at the 50-minute mark. Also, make sure the brown butter is not too hot when you add it to the wet ingredients—if it's too hot, it can scramble the egg. Let it cool for 5 minutes before whisking in.

How to tell it’s done

The banana bread is done when the top is deep golden brown and cracked, and a toothpick inserted into the center comes out mostly clean with a few moist crumbs attached. The internal temperature should register at least 160°F (71°C) in the center.

If the toothpick has wet batter, bake for another 5–10 minutes. The bread will continue to set as it cools, so avoid overbaking, which can dry it out. Let it cool in the pan for 10 minutes before transferring to a wire rack.

• Egg dishes: 160°F (71°C) in the thickest part