Quick Recipe Version (TL;DR)
Quick Ingredients
- 10 tbsp (140 g) unsalted butter, browned (8 tbsp for batter, 2 tbsp for swirl)
- 3 large very ripe bananas, mashed (about 1 1/2 cups / 340 g)
- 2 large eggs, room temperature
- 1/3 cup (80 g) full-fat Greek yogurt or sour cream
- 2 tsp vanilla extract
- 1 3/4 cups (220 g) all-purpose flour
- 1 tsp baking soda
- 1/2 tsp baking powder
- 1/2 tsp fine sea salt
- 1/2 tsp ground cinnamon (for batter) + 1 tsp (swirl) + 1 tsp (topping)
- 3/4 cup (150 g) packed light brown sugar (batter)
- 1/4 cup (50 g) granulated sugar (batter)
- 1/3 cup (70 g) packed dark brown sugar (swirl)
- 2 tbsp (25 g) granulated sugar + 2 tbsp (27 g) packed light brown sugar (topping)
- 1 tbsp (8 g) all-purpose flour (for swirl)
- 3/4 cup (85 g) chopped walnuts, toasted
Do This
- 1. Heat oven to 350°F (175°C). Grease and parchment-line a 9×5-inch loaf pan.
- 2. Brown 10 tbsp butter until nutty and amber; cool slightly. Reserve 2 tbsp for swirl.
- 3. Whisk dry: flour, baking soda, baking powder, salt, and 1/2 tsp cinnamon.
- 4. Mix wet: bananas, eggs, yogurt, vanilla, 3/4 cup brown sugar, 1/4 cup sugar, and 8 tbsp browned butter.
- 5. Fold dry into wet; add walnuts just until combined.
- 6. Stir swirl (reserved 2 tbsp brown butter, 1/3 cup dark brown sugar, 1 tsp cinnamon, 1 tbsp flour). Layer half batter, half swirl, rest of batter; marble lightly.
- 7. Mix topping (2 tbsp sugar + 2 tbsp brown sugar + 1 tsp cinnamon + pinch salt). Sprinkle on top. Bake 55–65 min; cool 15 min in pan, then on rack 1 hour.
Why You’ll Love This Recipe
- Browned butter adds deep, nutty complexity that pairs perfectly with bananas.
- A cinnamon–brown sugar crust caramelizes on top, while brown-butter swirls keep the crumb gooey.
- Thoughtful moisture boosters (ripe bananas + yogurt) mean tender slices for days.
- Walnuts add toasty crunch without overpowering the classic banana flavor.
Grocery List
- Produce: 3 very ripe bananas
- Dairy: Unsalted butter, eggs, Greek yogurt or sour cream
- Pantry: All-purpose flour, baking soda, baking powder, fine sea salt, vanilla extract, light brown sugar, dark brown sugar, granulated sugar, ground cinnamon, walnuts
Full Ingredients
Banana Bread Batter
- 8 tbsp (from browned butter below) browned unsalted butter, slightly cooled but still fluid
- 3 large very ripe bananas, mashed (about 1 1/2 cups / 340 g)
- 2 large eggs, room temperature
- 1/3 cup (80 g) full-fat Greek yogurt or sour cream
- 2 tsp vanilla extract
- 3/4 cup (150 g) packed light brown sugar
- 1/4 cup (50 g) granulated sugar
- 1 3/4 cups (220 g) all-purpose flour
- 1 tsp baking soda
- 1/2 tsp baking powder
- 1/2 tsp fine sea salt
- 1/2 tsp ground cinnamon
- 3/4 cup (85 g) chopped walnuts, toasted
Brown-Butter Swirl
- 2 tbsp browned unsalted butter (reserved from browning step)
- 1/3 cup (70 g) packed dark brown sugar
- 1 tsp ground cinnamon
- 1 tbsp (8 g) all-purpose flour
- Pinch fine sea salt
Cinnamon–Brown Sugar Topping
- 2 tbsp (25 g) granulated sugar
- 2 tbsp (27 g) packed light brown sugar
- 1 tsp ground cinnamon
- Pinch fine sea salt
Butter for Browning
- 10 tbsp (140 g) unsalted butter (you will brown this; 8 tbsp go in the batter, 2 tbsp in the swirl)
For the Pan
- Softened butter or nonstick spray, plus parchment paper for a sling
Step-by-Step Instructions
Step 1: Prep the pan and heat the oven
Preheat the oven to 350°F (175°C) with a rack in the center. Grease a 9×5-inch metal loaf pan and line it with a parchment sling that overhangs the long sides for easy removal. Lightly grease the parchment too.
Step 2: Brown the butter
Add 10 tbsp (140 g) unsalted butter to a light-colored saucepan. Melt over medium heat, then continue cooking, stirring and scraping the bottom, until the butter foams, the milk solids turn deep golden, and it smells nutty, 5–7 minutes. Immediately pour into a heatproof bowl to stop cooking, scraping in the browned bits. Cool until warm but still liquid (about 5–10 minutes). Measure out and reserve 2 tbsp for the swirl; the remaining 8 tbsp go into the batter.
Step 3: Whisk the dry ingredients
In a large bowl, whisk together the flour (1 3/4 cups / 220 g), baking soda (1 tsp), baking powder (1/2 tsp), salt (1/2 tsp), and cinnamon (1/2 tsp). Set aside.
Step 4: Mix the wet ingredients
In a separate bowl, mash the bananas until mostly smooth (1 1/2 cups / 340 g). Whisk in the eggs, yogurt, vanilla, light brown sugar (3/4 cup), granulated sugar (1/4 cup), and the 8 tbsp brown butter (cooled but fluid). The mixture should be glossy and well combined. If the butter is too hot to touch comfortably, wait a few minutes so it does not scramble the eggs.
Step 5: Make the brown-butter swirl and the topping
In a small bowl, stir together the reserved 2 tbsp brown butter, dark brown sugar (1/3 cup), cinnamon (1 tsp), flour (1 tbsp), and a pinch of salt to form a thick, spreadable paste. In a second small bowl, combine the topping: 2 tbsp granulated sugar, 2 tbsp light brown sugar, 1 tsp cinnamon, and a pinch of salt.
Step 6: Combine the batter and fold in walnuts
Pour the wet mixture into the dry. Gently fold with a spatula just until a few dry streaks remain. Fold in the toasted chopped walnuts (3/4 cup) until evenly distributed. Do not overmix; stop as soon as everything is incorporated.
Step 7: Layer, swirl, and top
Spread half the batter into the prepared pan. Dollop half the brown-butter swirl over the surface in teaspoons. Add the remaining batter and dollop the rest of the swirl on top. Use a butter knife or skewer to marble the swirl through the batter with 3–4 gentle figure-eight motions—avoid overmixing. Sprinkle the cinnamon–brown sugar topping evenly over the surface.
Step 8: Bake, test, and cool
Bake until the top is deeply caramelized and a toothpick inserted in the center comes out mostly clean with a few moist crumbs, 55–65 minutes (start checking at 50 minutes). If the top is browning too quickly, tent loosely with foil after 45 minutes. For the most precise doneness, aim for an internal temperature of 200–205°F (93–96°C). Cool in the pan for 15 minutes, then lift out and cool on a rack for at least 1 hour before slicing.
Pro Tips
- Use bananas that are very ripe—mostly brown skins with deep aroma. Measure 1 1/2 cups mashed for accuracy.
- Weigh your flour (220 g) to avoid a dry loaf. If measuring by cups, fluff, spoon, and level.
- Let the brown butter cool to warm before adding to the wet ingredients so the eggs do not curdle.
- Toast walnuts (350°F/175°C for 8–10 minutes) to amplify their flavor and crunch.
- For clean slices, let the loaf cool at least 60 minutes and use a serrated knife with gentle sawing motions.
Variations
- Chocolate-Walnut Swirl: Fold 1/2 cup semi-sweet chocolate chips into the batter with the walnuts. Keep the brown-butter swirl and topping as written.
- Maple Pecan: Swap walnuts for toasted pecans and replace 1/4 cup of the 3/4 cup brown sugar in the batter with 1/4 cup pure maple syrup; reduce yogurt to 1/4 cup to balance moisture.
- Nut-Free: Omit walnuts and add 1/2 cup toasted pumpkin seeds or leave plain. The swirl and topping still deliver plenty of texture.
Storage & Make-Ahead
Store cooled banana bread tightly wrapped at room temperature for up to 3 days. For longer storage, wrap slices individually and freeze up to 3 months; thaw at room temperature, then warm in a 300°F (150°C) oven for 8–10 minutes or toast lightly. You can brown the butter up to 3 days ahead; refrigerate and gently rewarm to liquid before using. The cinnamon–brown sugar topping and swirl paste can be mixed a day in advance and kept covered at room temp.
Nutrition (per serving)
Approximate for 1 of 12 slices: 360 calories; 18 g fat; 48 g carbohydrates; 5 g protein; 1–2 g fiber; 280 mg sodium; 26 g sugars.
