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    Home » Recipes » Brownies & Bars

    Published: Aug 23, 2023 by Sloane · This post may contain affiliate links · Leave a Comment

    Nutella Swirled Banana Blondies

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    5 from 2 votes

    These Nutella swirled brown butter banana blondies are a banana bread lover's dream! They're just as moist and packed full of banana flavor as classic banana bread, but with a dense, chewy texture and creamy Nutella in every bite.

    banana blondies cut into squares on parchment paper.

    If you're a fan of banana bread, you'll be an even bigger fan of these banana blondies! They're filled with super sweet mashed bananas, rich and nutty brown butter, and silky smooth chocolate hazelnut swirls in every square. These blondies are the perfect quick dessert for birthdays or parties–and the best part is, you can add as much Nutella as you want!

    For more blondie recipes, try Brownie Blondies, Gingerbread Blondies, and Gooey Candy Bar Blondies.

    Jump to:
    • Why you'll love these banana blondies
    • Ingredient Notes
    • Step by Step Ingredients
    • Expert Baking Tips
    • Recipe FAQs
    • Baking in Grams
    • Other brownie and bar recipes you'll love
    • 📖 Recipe
    • 💬 Reviews

    Why you'll love these banana blondies

    • Pronounced Banana Flavor: There's no mistaking the banana in these blondies! You'll taste sweet banana throughout the entire batch, especially if they're as ripe as possible.
    • Moist & Chewy Texture: These blondies are the perfect balance of banana bread and blondies–soft and moist like banana bread, but still dense and chewy like brownies and blondies.
    • Rich Notes of Brown Butter: The brown butter gives these blondies a rich, decadent flavor that compliments the super sweet bananas and Nutella.
    • Creamy Nutella Swirl: Enjoy a swirl of creamy, chocolatey Nutella with every bite you take–and add as much as you like!

    Ingredient Notes

    • Nutella: Use your favorite chocolate hazelnut spread to top these blondies. I used Nutella!
    • Bananas: Use over-ripe, browning bananas for the sweetest flavor.
    • Flour: Use high quality unbleached all-purpose flour best results.
    • Sugars: I opted for dark brown sugar in this recipe because the extra molasses content that adds more depth of flavor, but you can use light brown sugar. 
    • Butter: Make sure to brown your butter for the best overall flavor.
    • Eggs: You'll only need one egg and one egg yolk.
    • Vanilla: Add a high quality vanilla extract for optimal flavor.

    See recipe card for full information on ingredients and individual quantities.

    Step by Step Ingredients

    Here are step by step photos and instructions on how to make this Nutella swirled banana blondie recipe! For the full ingredient list and method, see the recipe card at the end of this post.

    dry ingredients in a glass bowl.
    STEP 1
    browned butter in a glass measuring cup.
    STEP 2

    STEP 1: Mix dry ingredients. In a medium bowl, combine the flour, baking powder, and salt. Set aside.

    STEP 2: Brown the butter. Melt the butter over medium heat, stirring with a rubber spatula as it melts. Once the butter turns a dark golden color and the fat solids have darkened and settled at the bottom of the pan, remove from heat and immediately pour into a large bowl, scraping out the fat solids at the bottom. Weigh out the butter to 184g (13 tbsp). 

    wet ingredients for banana blondies in a glass bowl.
    STEP 3
    mashed bananas on a white plate.
    STEP 4

    STEP 3: Whisk. To the brown butter, whisk in the brown sugar and granulated sugar. Then, vigorously whisk in the egg, egg yolk, and vanilla until fully combined.

    STEP 4: Mash bananas. On a medium plate, mash the bananas until smooth.

    mashed bananas being mixed into wet ingredients in a glass bowl.
    STEP 5
    prepared banana blondie batter in a glass bowl.
    STEP 6

    STEP 5: Add bananas. Whisk the mashed bananas into the batter.

    STEP 6: Mix in dry ingredients. Add the dry ingredients to the batter and use a rubber spatula to fold until just combined. 

    banana blondie batter in baking pan with Nutella swirled on top.
    STEP 7
    baked banana blondies cut into squares on parchment paper.
    STEP 8

    STEP 7: Spread Nutella. Prepare a 9 inch baking pan with parchment paper. Pour the batter into the pan, then dollop the Nutella on top and use a toothpick to swirl it in. 

    STEP 8: Bake. Bake the banana blondies for about 30 minutes until evenly golden. Allow them to cool completely in the pan before removing and cutting into 16 squares.

    Expert Baking Tips

    • Start with 227g (16 tbsp) unsalted butter. Start with a few extra tablespoons of butter, since water evaporates as it browns. Also, keep in mind that European-style butter has less water content, so if you're using American-style butter you might want to start with even more butter.
    • Use very ripe bananas. The riper the better! Bananas become sweeter and more flavorful as they ripen, so wait until your bananas are spotty and falling off of their stems to make these blondies. 
    • Measure the Nutella with your heart. There's no right or wrong amount of Nutella, so add as much or as little as you'd like! 
    banana blondies cut into squares on parchment paper with three blondies standing on their sides.

    Recipe FAQs

    Can I use regular melted butter instead of brown butter?

    Yes! The flavor won't be as nutty and rich, but you can definitely use regular melted butter to make these blondies.

    Why are my blondies dry?

    Similar to any cookie or bar recipe that has few ingredients, the dry to wet ratio has a very small margin of error. If you add too much flour, over-mix, or over-bake these blondies, they will likely turn out dry. That's why it is SO important to weigh your ingredients (at the very least the flour) rather than using volume measuring cups. When baking, be sure to check them very frequently! It also never hurts to err on the side of slightly under-baked!

    Can this recipe be doubled?

    Yes! Simply double the quantity of each ingredient and follow the directions as written, but bake the blondies in a 9x13 pan.

    Storage Tips:

    Store leftover Nutella banana blondies in a sealed container at room temperature for 3-5 days, or individually wrapped in the freezer for up to 3 months.

    banana blondies cut into squares on parchment paper with a bite taken out of one.

    Baking in Grams

    All of the recipes on this blog are carefully developed with gram measurements so you can easily recreate them in your own kitchen with success. Volume measurements are extremely inaccurate and leave room for significant errors. Not all measuring cups are made equally, so your one cup of flour will be different from my one cup of flour. By providing precise measurements in grams (aside from minor ingredients, which are given in tsp/tbsp), you can make these recipes accurately and with less cleanup! All you need is this kitchen scale. 

    If this still isn't enough to convince you, I have provided volume measurements in the recipe card. If you are interested in understanding the conversions, this is the best conversion chart.

    But trust me, once you try baking in grams you'll never turn back!

    Happy baking! x

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      Cherry Pie Bars
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      Decadent Oreo Brownies
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    If you tried this recipe, I'd love to know how it turned out for you! Leave a star rating & review below and post a picture (or video!) on Instagram and tag me so I can see your bakes! Not ready to make this recipe yet? Click the heart button on the right of your screen to save it for later 🙂

    📖 Recipe

    banana blondies cut into squares on parchment paper.
    5 from 2 votes
    Print Recipe Pin Recipe Save for LaterSaved!

    Nutella Swirled Banana Blondies

    These Nutella swirled brown butter banana blondies are a banana bread lover's dream! They're just as moist and packed full of banana flavor as classic banana bread, but with a dense, chewy texture and creamy Nutella in every bite.
    Prep Time 30 minutes mins
    Cook Time 30 minutes mins
    Total Time 1 hour hr
    Servings16 bars
    Coursebars
    CuisineAmerican
    AuthorSloane
    Prevent your screen from going dark

    Equipment

    Kitchen Scale
    Square Pan

    Ingredients

    • 270 g (2 ¼ cup) all-purpose flour
    • 1 teaspoon baking powder
    • ½ teaspoon salt
    • 184 g (13 tablespoon) browned butter, start with 227g (16 tbsp) unsalted butter
    • 213 g (1 cup) brown sugar
    • 150 g (¾ cup) granulated sugar
    • 1 egg
    • 1 egg yolk
    • 2 teaspoon vanilla extract
    • 170 g mashed banana, about 1 ½ over-ripe bananas
    • 74 g (4 tablespoon) Nutella

    Instructions

    • Preheat the oven to 350 degrees F. Line a pullman or 9 inch square pan with parchment paper, leaving the ends hanging over the sides for easy removal.
    • In a medium bowl, combine the flour, baking powder, and salt. Set aside.
    • Brown the butter: In a small saucepan, add 227g (16 tbsp) of unsalted butter and place over medium heat. As the butter melts, stir it with a rubber spatula to encourage even cooking. Once the butter has fully melted, it will alternate between rapid large bubbles and gentle small foamy bubbles. The butter will be ready once it turns a dark golden color and the fat solids have darkened and settled at the bottom of the pan. Immediately pour into a large bowl, scraping out the fat solids at the bottom, and weigh out to 184g (13 tbsp).
    • To the brown butter, whisk in the brown sugar and granulated sugar. Then, vigorously whisk in the egg, egg yolk, and vanilla until fully combined.
    • On a medium plate, mash the bananas until smooth. Whisk the mashed bananas into the batter.
    • Add the dry ingredients to the batter and use a rubber spatula to fold until just combined.
    • Pour the batter into the prepared pan, then dollop the Nutella on top and use a toothpick to swirl it in.
    • Bake the banana blondies for about 30 minutes until evenly golden. Allow them to cool completely in the pan before removing and cutting into 16 squares.

    Notes

    • Start with 227g (16 tbsp) unsalted butter. Start with a few extra tablespoons of butter, since water evaporates as it browns. Also, keep in mind that European-style butter has less water content, so if you're using American-style butter you might want to start with even more butter.
    • Use very ripe bananas. The riper the better! Bananas become sweeter and more flavorful as they ripen, so wait until your bananas are spotty and falling off of their stems to make these blondies. 
    • Measure the Nutella with your heart. There's no right or wrong amount of Nutella, so add as much or as little as you'd like! 

    Nutrition Facts

    Serving: 1bar | Calories: 274kcal | Carbohydrates: 41g | Protein: 3g | Fat: 11g | Saturated Fat: 7g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Trans Fat: 0.4g | Cholesterol: 47mg | Sodium: 184mg | Potassium: 101mg | Fiber: 1g | Sugar: 26g | Vitamin A: 325IU | Vitamin C: 1mg | Calcium: 40mg | Iron: 1mg
    Tried this recipe?Tag @sloanes.table on Instagram and write a star review below!

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    Hi, I'm Sloane! Welcome to Sloane’s Table! I am a Dartmouth College alumna, professional baker, recipe developer, and food photographer. Here, you will find tried & true bakery-worthy recipes ranging from simple sweets to technical pastries.

    Learn more about me →

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