Sourdough S'mores Banana Bread

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Imagine your favorite sourdough banana bread, topped with everything you love about s'mores? Well then you'd have this sourdough s'mores banana bread! It's absolutely delicious and well worth letting some bananas go brown on your counter for.

If you love all things s'mores, you might also enjoy these sourdough s'mores cookies!

A flat lay photo of sourdough s'mores banana bread taken from above. There is a loaf of sourdough s'mores banana bread that has been sliced up so you can see the crumb inside. A piece of the loaf is sitting on a white plate.

Why You'll Love This Recipe!

Banana Bread but better - if you love my sourdough discard banana bread recipe, then you are going to love this one! It's full of the banana flavor you love but elevated with crunchy sourdough graham crackers, smooth Hershey's chocolate pieces and gooey marshmallows!

Delicious Dessert - this sourdough s'mores banana bread makes a delicious dessert, served warm and topped with vanilla ice cream.

A close up photo of 2 slices of sourdough s'mores banana bread surrounded by Hershey's pieces and sourdough graham crackers. There is also a black and white dish towel in the background of the photo.

Ingredients

  • Bananas - I've used approximately 3 overripe bananas to create this recipe.
  • Eggs - my eggs are quite large (60g to 70g), so if yours are smaller, I recommend increasing to 3 eggs.
  • Butter - as always I've used salted butter, but you can use unsalted if you prefer. Must be melted and cooled slightly. I pop the butter in the microwave when I first start making it and then it sits and cools and is ready when I need it.
  • Sourdough Starter - you can use bubbly, active sourdough starter or sourdough discard, whatever you have on hand.
  • All Purpose Flour
  • Cocoa Powder - nothing fancy here, I've just used supermarket brand cocoa powder.
  • Baking Powder
  • Sugar - I've used a mix of both brown and white sugar.
  • Salt - just a little to balance out the flavor.
  • Graham Crackers - I've used sourdough graham crackers but you can use store bought crackers if you want to.
  • Hershey's Milk Chocolate Pieces - I've used 3 bars of Hershey's Milk Chocolate to create this recipe. I broke up 2 bars and mixed into the sourdough banana bread itself and then used the third bar to garnish the top.
  • Marshmallows - I've used white marshmallows cut into quarters for the banana bread itself and then cut them in half for the top of the sourdough s'mores banana bread.
Flat lay of ingredients necessary to make sourdough banana bread.

How To Make Sourdough S'mores Banana Bread

Preheat oven to 180C/350F. Grease a loaf pan with butter and set aside.

Mash the overripe bananas with the back of a fork until they are fairly smooth (a few lumps is fine).

Now add the eggs and vanilla extract to the bananas and whisk through until well combined, followed by the melted butter.

Now add the sourdough starter to the egg mixture and mix throughly. Set aside.

In a separate bowl, mix the white sugar, brown sugar, all purpose flour, baking powder, salt, cocoa powder and Hershey's pieces and ensure that everything is mixed thoroughly.

A cream bowl filled with the dry ingredients to make sourdough s'mores banana bread. There is also a second bowl containing the wet ingredients.

Now add the dry ingredients to the wet ingredients and stir until just combined.

Pour the mixture into the pan you prepared earlier. Top the banana bread batter with the remaining marshmallows, graham crackers and Hershey's pieces.

A grey colored loaf pan filled with sourdough s'mores banana bread topped with marshmallows, crushed graham crackers and Hershey's pieces.

Bake at 180C/350F for around 1 hour. Baking time will depend on the size of your pan and your oven. The sourdough s'mores banana bread is cooked when a skewer is inserted and comes out clean.

Allow to cool for 30 minutes before removing from the pan and transferring to a wire cooling rack to cool completely. I recommend cooling fully for easier slicing.

A horizontal image featuring sourdough s'mores banana bread that has been sliced and displayed on a piece of parchment paper.

How To Store + Freeze

This sourdough s'mores banana bread is best eaten once cooled and sliced. Cooling first allows you to slice it much easier than when it's warm (but of course this is totally up to you, eat it straight out of the oven if you want to).

I've found this recipe stays fresh for up to 3 days. It's not quite as long lasting as other banana breads because of the marshmallows.

I don't recommend freezing this sourdough s'mores banana bread as the freezing process can mess with the marshmallows.

Sourdough S'mores Banana Bread - Pinterest Image
A flat lay photo of sourdough s'mores banana bread taken from above. There is a loaf of sourdough s'mores banana bread that has been sliced up so you can see the crumb inside. A piece of the loaf is sitting on a white plate.

Sourdough S'mores Banana Bread

This sourdough s'mores banana bread is a cozy twist on a classic, packed with gooey chocolate chunks, crushed graham crackers, and toasted marshmallows. With the added depth of sourdough starter and the sweetness of ripe bananas, every slice is rich, moist, and irresistibly nostalgic.
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Prep Time 10 minutes
Cook Time 1 hour
Total Time 1 hour 10 minutes
Servings 10 Slices
Calories 384 kcal

Equipment

  • Loaf Pan (I've used a 1 pound USA pan)

Ingredients  

  • 200 g Bananas (approx. 3 medium overripe bananas)
  • 2 Eggs (mine were approx. 60g each)
  • 80 g Butter (melted - can be salted or unsalted)
  • 100 g Sourdough Starter (discard or fed & bubbly)
  • 200 g All Purpose Flour
  • 30 g Cocoa Powder
  • 12 g Baking Powder
  • 100 g Brown Sugar
  • 50 g White Sugar
  • 3 g Salt
  • 70 g Graham Crackers (I've used sourdough graham crackers)
  • 86 g Hershey's Milk Chocolate Pieces (2 bars broken into pieces)
  • 70 g Marshmallows (either mini marshmallows or larger ones chopped up)

Topping

  • 30 g Graham Crackers (I've used sourdough graham crackers)
  • 43 g Hershey's Milk Chocolate Pieces (1 bar broken into pieces)
  • 30 g Marshmallows

Instructions 

  • Preheat oven to 180C/350F. Grease a loaf pan with butter and set aside.
  • Mash the overripe bananas with the back of a fork until they are fairly smooth (a few lumps is fine).
  • Now add the eggs and vanilla extract to the bananas and whisk through until well combined, followed by the melted butter.
  • Now add the sourdough starter to the egg mixture and mix throughly. Set aside.
  • In a separate bowl, mix the white sugar, brown sugar, all purpose flour, baking powder, salt, cocoa powder and Hershey's pieces and ensure that everything is mixed thoroughly.
  • Now add the dry ingredients to the wet ingredients and stir until just combined.
  • Pour the mixture into the pan you prepared earlier. Top the banana bread batter with the remaining marshmallows, graham crackers and Hershy's pieces.
  • Bake at 180C/350F for around 1 hour. Baking time will depend on the size of your pan and your oven. The sourdough s'mores banana bread is cooked when a skewer is inserted and comes out clean.
  • Allow to cool for 30 minutes before removing from the pan and transferring to a wire cooling rack to cool completely. I recommend cooling fully for easier slicing.

Nutrition

Serving: 100g Calories: 384kcal Carbohydrates: 64g Protein: 5g Fat: 13g Saturated Fat: 8g Polyunsaturated Fat: 1g Monounsaturated Fat: 3g Trans Fat: 0.3g Cholesterol: 50mg Sodium: 386mg Potassium: 227mg Fiber: 3g Sugar: 34g Vitamin A: 260IU Vitamin C: 2mg Calcium: 113mg Iron: 2mg
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