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Banana Coffee Cake with Walnut Streusel

If banana bread and coffee cake had a baby, it would be this Banana Coffee Cake with Walnut Streusel. If you love bananas you’ll love this moist banana cake ribboned with brown sugar walnut streusel and topped with walnut crumble.

a slice of banana coffeecake on a white plate

There’s not really much to say about this recipe other than I had a bunch of bananas that were perfectly ripe for baking and would be too mushy to eat within about a day. So I decided it was time to bake something with those bananas.

Banana bread is fine, but I wanted a breakfast cake and decided to turn the banana bread into a coffee cake because who doesn’t want a ribbon of streusel and a pile of brown sugar crumbs on their breakfast?

Bananas and walnuts are a natural pair and I always have walnuts in the pantry so the recipe would be a Banana Coffee Cake with Walnut Streusel.

How I created Banana Coffee Cake recipe:

I used a basic vanilla cake recipe as the starting point. I always use sour cream in my vanilla cake because I love the flavor and moisture it adds, plus the acidity tenderizes the cake crumb.

Because I was adding bananas, which add a lot of moisture and some sweetness, I reduced the amount of eggs and sour cream in the recipe.

I also reduced the sugar a little bit, not only because the bananas were sweet, but since this was a breakfast cake I wanted the cake part a little less sweet. The streusel and crumb topping also add extra sweetness.

For more information about how to develop a new cake recipe visit this post about the Baker’s Formula.

See how to put together a Banana Coffee cake with a walnut streusel layer:

a bowl of smashed bananas to make banana coffee cake

When I bake with bananas I prefer to just mash them with a fork, rather than puree them in a blender or food processor. I like to have some chunks of banana visible plus I find that when bananas are pureed they can get a little gummy.

walnut streusel sprinkled onto banana coffee cake batter

Put half the batter into the pan, then sprinkle the streusel over the batter.

crumb topping on a banana coffeecake ready for the oven

Spread the rest of the batter into the pan and crumble the topping in large chunks over the batter.

I baked the cake in a 9″ springform pan to make it easy to unmold without disturbing the crumb topping.

I also baked the same recipe as jumbo muffins. I got a dozen from the recipe. If you use a standard muffin tin you’ll probably get 18-24.

Don’t overfill the muffin cups or the muffins will overrun the pan and sink in the middle. The muffin tins should only be about 1/2 full once the crumbs are added. You’re better off under filling than over filling the pans.

a stack of banana coffeecake muffins

The recipe can also be baked as Banana Streusel Muffins.

a top view of a banana coffeecake sprinkled with sugar

banana coffeecake on a white plate with a fork

If you love this recipe please consider giving it 5 stars.

Banana Coffee Cake with Walnut Streusel

Banana Coffee Cake with Walnut Streusel

Yield: 12 servings
Prep Time: 30 minutes
Cook Time: 1 hour
Total Time: 1 hour 30 minutes

Super moist banana cake layered with walnut streusel and topped with walnut crumb topping.

Ingredients

Streusel

  • 1/3 cup (2.5 oz, 70 g) brown sugar
  • 1/3 cup (2.5 oz, 70 g) granulated sugar
  • 1 cup (4 oz, 115 g) Walnuts
  • 2 teaspoons ground cinnamon
  • 1/2 cup (2 oz, 58g) cake flour
  • 2 oz (1/2 stick, 55g) unsalted butter, softened to room temperature

Batter

  • 1 cup (about 2 medium, 8oz, 230g) smashed ripe Bananas
  • 1/2 cup (4 oz, 115g) sour cream
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 2 cups (8 oz, 230g) cake flour
  • 3/4 cup (6 oz, 170g) granulated sugar
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon baking powder
  • 1/2 teaspoon table salt
  • 6 oz (1 1/2 sticks, 170 g) unsalted butter, softened to room temperature

Instructions

Make the Streusel

  1. Combine the sugars, walnuts and cinnamon in a food processor
  2. Process until the nuts are chopped coarsely but not ground to a powder
  3. Remove 2/3 cup (3.4 oz, 95g) for filling
  4. Add the flour and butter to the remaining streusel and process until it just begins to form clumps

Make the Batter

  1. Butter and Flour a 9" springform pan. Preheat the oven to 350°F .
  2. Combine the smashed bananas with the sour cream, eggs and vanilla extract, set aside.
  3. In a mixing bowl, combine the flour, sugar, baking soda, baking powder and salt. Mix the dry ingredients on low speed to distribute the salt and leavening.
  4. With the mixer running on low, add the butter to the dry ingredients. Add 1/2 the banana mixture and increase the speed to medium. Mix on medium speed for 2 minutes to lighten the batter. Scrape the bowl and beater.
  5. With the mixer on low speed add the remaining banana mixture in two batches. Scrape the bowl and beater between additions.
  6. Pour 1/2 of the batter into the prepared pan and smooth to an even layer. Sprinkle the reserved streusel filling over the batter. Drop dollops of the remaining batter over the filling and smooth to an even layer.
  7. Grab big clumps of the streusel topping and break them into chunks evenly over the batter.
  8. Bake until the cake springs back when lightly touched or a toothpick inserted in the center comes out clean, about 45 minutes
  9. Cool for 10 minutes before releasing the springform pan

Notes

The cake keeps well at room temperature for several days.

The recipe can also be baked as muffins. You should get about 12 jumbo or 24 standard muffins.

Did you make this recipe?

Please leave a comment on the blog or share a photo on Instagram

Since you love coffee cake, try these other fabulous recipes: Sourdough Coffee Cake, Pumpkin Coffee Cake, Peach & Pecan Coffee Cake, Blueberry Crumb Coffee Cake.

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Kris Marie

Sunday 3rd of January 2021

No cake flour, can I use AP flour?

Eileen Gray

Sunday 3rd of January 2021

Yes, for each cup of cake flour use 3/4 cup ap flour plus 2 tablespoons corn starch.

chirry

Tuesday 11th of July 2017

Thanks for the recipe. What can I replace walnuts with?

Eileen Gray

Tuesday 11th of July 2017

Hi Chirry. You could use a different nut. If you can't do nuts at all then I would increase the flour by a 1/2 cup to replace the walnuts.

Erica

Sunday 26th of March 2017

Just made for work tomorrow. Super excited to see how it taste. Couldn't locate my spring form pan and left my jumb muffin pan at moms.. so I baked in a 9x9 dish. Super excited. I'm sure it will be tasty

Eileen Gray

Monday 27th of March 2017

That's great, Erica. I hope you like it!

Maureen Minchew

Saturday 11th of February 2017

Super share it is actually. We have been awaiting for this tips.

Corina

Wednesday 11th of May 2016

This cake looks wonderful with the streusal layer in the middle too! I have three overripe bananas sitting near me right now and I know I am quite tempted to jump up and make this cake right now!

Eileen Gray

Wednesday 11th of May 2016

Hmmm, three overripe bananas, perfect! Go for it! Thanks for reading, Corina.