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.
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:
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.
If you love this recipe please consider giving it 5 stars.
Banana Coffee Cake with Walnut Streusel
- 2 ½ oz brown sugar (⅓ cup)
- 2 ½ oz granulated sugar (⅓ cup)
- 4 oz walnuts (1 cup)
- 2 teaspoons ground cinnamon
- 2 ¼ oz cake flour (½ cup)
- 2 oz unsalted butter (room temperature)
- 8 oz very ripe bananas (1 cup mashed)
- 4 oz sour cream (½ cup)
- 2 large eggs
- 1 teaspoon vanilla extract
- 9 oz cake flour (2 cups)
- 6 oz granulated sugar (¾ cup)
- ½ teaspoon baking soda
- ½ teaspoon baking powder
- ½ teaspoon table salt
- 6 oz unsalted butter (room temperature)
Make the Streusel
- Combine 2 ½ oz brown sugar, 2 ½ oz granulated sugar, 4 oz walnuts and 2 teaspoons ground cinnamon in a food processor. Process until the nuts are chopped coarsely but not ground to a powder. Remove ⅔ cup (3½ oz) for filling, Add 2 ¼ oz cake flour and 2 oz unsalted butter to the remaining streusel and process until it just begins to form clumps.
Make the Batter
- Butter and flour a 9" springform pan. Preheat the oven to 350 °F.
- Combine 8 oz very ripe bananas (mashed) with 4 oz sour cream, 2 large eggs and 1 teaspoon vanilla extractt, set aside.
- In a mixing bowl, combine 9 oz cake flour, 6 oz granulated sugar, ½ teaspoon baking soda, ½ teaspoon baking powder, and ½ teaspoon table salt. Mix the dry ingredients on low speed to distribute the salt and leavening.
- With the mixer running on low, add 6 oz unsalted butter to the dry ingredients. Add ½ 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.
- With the mixer on low speed add the remaining banana mixture in two batches. Scrape the bowl and beater between additions.
- Pour ½ 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. Grab big clumps of the streusel topping and break them into chunks evenly over the batter.
- Bake until the cake springs back when lightly touched or a toothpick inserted in the center comes out clean, about 45 minutes.
- Cool for 10 minutes before releasing the springform pan.
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