Banana Cake with Coffee Walnut Buttercream


Banana Cake with Coffee Walnut Buttercream

Banana Cake with Coffee Walnut Buttercream


Happy Monday morning, everyone!


I have another special treat for you today …… another delicious dessert I can’t take a credit for.


….. I made this BANANA CAKE with COFFEE WALNUT BUTTERCREAM as a part of monthly baking challenge for a group of wonderful bakers I happened to be part of called The Cake Slice.


The Cake Slice is lead by my friend Paloma from The Coffee Shop. Each year we pick a book from which we will be baking ….. then every month we vote which cake we will re-crate.


This year we are baking from VINTAGE CAKES by Julie Richardson ……. January cake is BANANA CAKE with COFFEE WALNUT BUTTERCREAM.


Banana Cake with Coffee Walnut Buttercream


I admit, I was intrigued by the combination of banana …. espresso ….. walnuts …… bourbon.


The BANANA CAKE is wonderful ….. soft …… moist ….. flavorful.

The  Coffee Walnut Buttercream on the other hand was a let down for me …… I was not a fan of the combination of walnuts, espresso and bourbon.


Three strong flavors that are trying to overpower each other.

I wish I would use combination of pecans & bourbon …….. or espresso & chocolate ……. or walnuts & rum.


Next time I will try the BANANA CAKE with a different buttercream.


Banana Cake with Coffee Walnut Buttercream

Banana Cake with Coffee Walnut Buttercream




  • 2½ cups all-purpose flour
  • 1½ teaspoons baking powder
  • ¼ teaspoon baking soda
  • 1½ cups mashed ripe bananas (about 3)
  • ¾ cup buttermilk, at room temperature
  • 1 cup unsalted butter, at room temperature
  • 2 cups sugar
  • 1 tablespoon pure vanilla extract
  • 4 eggs, at room temperature

STEP 1: Preheat the oven to 350℉. Grease three 13″X9″ cake pans. Line the bottom of the pans with parchment paper. (Original recipe calls for 3 – 8″ round cake pans).

STEP 2: In a large bowl whisk together flour, baking powder, baking soda and salt. Set aside.

STEP 3: In a small bowl combine mashed banana with buttermilk. Set aside.

STEP 4: Cream butter, sugar  and vanilla using kitchen mixer on high speed until fluffy  stopping mixer frequently to scrape the sides.

STEP 5: Beat in the eggs one at a time.

STEP 6: On low speed add the flour mixture in three parts  alternating with the banana mixture in two parts. Always begin and end with flour.

STEP 7:  Stop  mixer before the last of the flour has been incorporated and complete the blending by hand with a rubber spatula.

STEP 8: Divide the cake batter equally among the prepared pans. Make sure top is even.

STEP 9: Bake until the centers spring back when lightly touched  – 15-18 minutes.

STEP 10: Cool the cakes in their pans on a wire rack for 30 minutes.  Flip them out and let them continue to cool on the rack. Leave the parchment paper on until you assemble the cake.


Banana Cake with Coffee Walnut Buttercream


Coffee Walnut Buttercream

  • 1 cup toasted chopped walnuts
  • ¼ cup corn syrup
  • ¼ cup bourbon
  • 2 tablespoons instant espresso powder
  • 5 egg whites
  • 1¼ cups sugar
  • ¼ teaspoon cream of tartar
  • 1½ cups unsalted butter, at room temperature
  • ¼ teaspoon of fine sea salt

STEP 1: Prepare Walnut-Espresso paste.

  1. Puree  walnuts in a food processor until they  begin to form a paste.
  2. Add corn syrup, bourbon and espresso powder and blend until combined.  Set aside.

STEP 2: In a bowl whisk together egg whites, sugar, and cream of tartar.

STEP 3: Place the bowl over a saucepan with simmering water.  The egg mixture will be gloppy and thick, but as the mixture begins to warm it will become more fluid.

STEP 4: Continue to gently whisk the mixture until it is very hot to touch (130℉ on a candy thermometer).

STEP 5: Move the bowl to the stand mixer and using the whisk attachment whip the whites on medium-high speed until they have tripled in volume and are thick and glossy and hold stiff peaks (like meringue).  Turn the mixture down to medium-low speed until the mixing bowl is just cool to touch, 1 to 2 minutes.

STEP 6: Kick the mixer back up to medium-high speed and  add  butter one piece at a time, adding the next piece just as the previous one has been incorporated. Stop the mixer every every now and again to scrape down the sides. At some point the buttercream will appear curdled, but this is normal, so keep mixing until it all comes together again.

STEP 7: Once all of the butter has been incorporated and the frosting is fluffy and creamy add  salt and Walnut-Espresso paste.  Mix until fully combined.


Banana Cake with Coffee Walnut Buttercream

Banana Cake with Coffee Walnut Buttercream

To Assemble Cake:

STEP 1: Lay one of the cakes top side up on a cake plate.  Using a metal spatula frost the top with 1/3  of  the buttercream.

STEP 2: Stack the second cake top side up on top of the frosted cake and spread another 1/3 of  the buttercream on top of it.  Stack the last layer of cake top side up on top.

STEP 3: Apply a thin layer of frosting all over the cake to create crumb coat.  Place the cake in the fridge or freezer until the frosting is firm.

STEP 4: Frost the cake with the remaining buttercream and decorate as you wish.


Banana Cake with Coffee Walnut Buttercream

Banana Cake with Coffee Walnut Buttercream


Don’t forget …. Keep Smiling …. Keep Cooking!





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© Copyright 2013FoodieBibi, All rights Reserved. Written For: Bibi's Culinary Journey

25 Responses to “Banana Cake with Coffee Walnut Buttercream”

  1. Paloma says:

    oh Bibi! Your cake looks great! I am sorry the buttercream was so overpowering… I read that happened to others too! :( you did a beautiful job! like always!
    Paloma recently posted..The Cake Slice and The Classic CakeMy Profile

    • FoodieBibi says:

      Thank you, Paloma! I just came back from my best friend’s house as she loved it.It wasn’t what she expected at first, but the flavor grew on her :)

  2. Yenta Mary says:

    Oh, my word! It looks like a European torte from a fancy coffee shop! And with all that butter, coffee, and bourbon … sigh. Perfect to go with my cocoa … :)
    Yenta Mary recently posted..Brown Sugar Apple Pie for Inauguration DayMy Profile

  3. Bibi, I must say that your cake looks just like the one I saw in the cake shop when I was much younger. Your cake totally depict the vintage cake! It’s a pity you didn’t like the buttercream though it looks awesome to me. A very good try!
    Grace (Life can be simple) recently posted..Dark Chocolate-Almond CakeMy Profile

    • FoodieBibi says:

      Thank you so much, Grace. I didn’t care much for the buttercream, but unlike me, my best friend really enjoyed it:)

  4. Bibi, I want to LIVE in the layers of that cake. :) The sprinkles on top are the perfect finishing touch! *Sigh!* :)
    Joy (Yesterfood) recently posted..Classic Yellow Cake with Chocolate FrostingMy Profile

  5. Anabel says:

    Your cake is layered nicely, and looks really delicious! I dont think I have ever had bourbon before, and was quite afraid to use it, so I left mine out and cut back on the coffee. I’m glad I did, everyone who stuck with the original recipe agrees with you.
    Anabel recently posted..Banana Cake with Walnut ButtercreamMy Profile

    • FoodieBibi says:

      Thank you, Anabel. I wish I made some changes as well, but I was really intrigued with the original flavors. It won’t go to waste as my best friend & her daughter love it ,lol :)

  6. Holly says:

    Such a bummer you didn’t like the frosting after all that work. But your cake looks beautiful and we all learn with each attempt.
    Holly recently posted..The ClassicMy Profile

    • FoodieBibi says:

      Absolutely, Holly! I had a feeling the buttercream would be strong, but I wanted to try it. I know what changes to do next time :)

  7. Bibi…this cake is just gorgeous! You can really see the tender layers of cake and your buttercream looks so luscious! I really thought the buttercream flavors were fighting each other, too. The bourbon was the flavor that took over…but it was good. I’d make a few changes next time as well! But beautiful job with this cake! : )
    Anne@FromMySweetHeart recently posted..Soup WeekMy Profile

  8. Looks AMAZING! I just posted a banana cake recipe today, too! Looks like we both had bananas on the mind ;)
    Devi McDonald @ Diddles and Dumplings recently posted..Chocolate Chip Banana CakeMy Profile

  9. Wow, that cake looks delicious! Coffee walnut buttercream sounds amazing, and I love all the layers going on in that cake. Thanks for the recipe!
    Holly @ Woman Tribune recently posted..Tuesday Giveaway Linkup: January 22nd – January 29thMy Profile

  10. charlene says:

    Wow, I now wish I had baked the banana cake after seeing your stunning pictures! x

  11. Modern Gypsy says:

    That looks beautiful! The buttercream though just sounds wrong. Too many powerful flavors there. Your idea of espresso and chocolate sounds much better!!
    Modern Gypsy recently posted..Book review: The Family Corleone by Ed FalcoMy Profile

  12. Wow, your cake looks really fancy. Like restaurant fancy. I like how you make it a square cake instead of the usual round. I think the shape makes the cake look extra special :)
    Becca – Cookie Jar Treats recently posted..Cake Slice Bakers – January 2013: The ClassicMy Profile

  13. Cucina49 says:

    Wow, that looks beautiful with all of the different layers. It almost looks like tiramisu!
    Cucina49 recently posted..TriageMy Profile

  14. Emily says:

    Wonderful results with all those layers of goodness!

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