• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar
  • About
  • Contact
Check out my cookbook

The Toasted Pine Nut

fun. flavorful. feel-good recipes.

  • Check out my cookbook!
  • Recipes
    • Dessert
      • Cookies
      • Bars & Brownies
      • Breads & Muffins
      • Cakes & Cupcakes
      • Pies & Crumbles
      • Candy
      • No Bake
    • Meal
      • Breakfast
      • Main Dishes
      • Appetizers
      • Sides
      • Snacks
      • Drinks
      • Salads
      • Sauces & Dips
      • Dessert
    • Diet
      • Gluten Free
      • Dairy Free
      • Vegan
      • Vegetarian
      • Egg Free
      • Kid Friendly
      • Low Carb
      • Nut Free
    • Meat
      • Fish & Seafood
      • Chicken & Poultry
      • Beef & Pork
      • Meatless
    • Method
      • Air Fryer
      • Slow Cooker
      • Instant Pot
      • Oven
      • Grill
      • Stovetop
    • Season
      • Spring
      • Summer
      • Fall
      • Winter
    • Recipe Filter
  • Shop
    • My Baking Mixes
    • Kitchen Essentials
    • Pantry Items
    • Kid Favorites
    • Photography
  • Cookbook
  • Videos
Home Recipes Desserts Cakes & Cupcakes

30-Min Fluffy & Moist Banana Oat Flour Cake

30 min
GF Gluten-Free
Avatar by: Lindsay Grimes Freedman
June 30, 2021 (Updated: October 28, 2022)
Jump to Recipe
Leave a Comment

This post may contain affiliate links. Please read our disclosure policy.

This is an overhead image of a view of a slice of oat flour cake. The cake is topped with a peanut butter whipped cream and crushed walnuts. The cake square sits on a white piece of parchment paper. Text overlay reads "oat flour banana cake with PB frosting!"
This is an overhead image of a view of a slice of oat flour cake. The cake is topped with a peanut butter whipped cream and crushed walnuts. The cake square sits on a white piece of parchment paper.
Banana oat flour cake is super moist and decadent. It’s naturally gluten free and topped with a fluffy peanut butter whipped cream frosting!

Oat flour cake is loaded with banana flavor and has the most fluffy peanut butter frosting on top! This cake is a mix between banana bread meets moist cake.

It’s truly a no-fuss cake. You mix it up in one bowl, bake it up and whip up the peanut butter frosting once it’s cool. Easy peasy.

I made this into a two layer 6 inch cake, but you cake definitely pour the batter into a square or rectangular pan for a sheet pan cake. It may make the slice cutting that much easier, but it’s up to you!

Ingredients and substitutions for this banana oat flour cake:

Bananas. You know those ripe, spotty bananas sitting on your counter? They’re soft, slightly brown? Grab ’em!

Eggs. Just two. If you don’t have any eggs or don’t want to use eggs, you can use your favorite egg replacer.

Agave Nectar. Honey or maple syrup also works if you want to sub it in.

Vanilla Extract. Just a splash for that vanilla, cakey vibes.

Oat Flour. I love using oat flour lately. If you don’t have any oat flour on hand, pulse some old fashioned oats in your blender or food processor until it forms a powder-y flour. Viola! You have oat flour.

Baking Powder & Salt. This is where the baking magic happens.

Ingredients for fluffy whipped peanut butter frosting

Heavy cream. I haven’t tested this with coconut cream or a dairy free alternative, so if you do any experimenting, let me know how it goes!

Peanut Butter. I use natural peanut butter, but other peanut butters or nut/seed butters would probably work here too.

Agave Nectar. For some sweetness! You can sub honey or maple syrup if you prefer!

Make this oat flour cake your own!

I wanted to make a classic banana cake so didn’t fold in any add-ins. But, add 1/2 cup chocolate chips or walnuts (or both!) to add some texture to this cake!

How to make this banana oat flour cake:

Mix up the cake batter. Mash the bananas in a large bowl. Add the eggs, agave nectar, and vanilla. Whisk until combined. Add the oat flour, baking powder, and salt. Whisk again until combined. 

Transfer to a pan and bake. Line an 8×8 or 9×9 square pan with parchment paper and transfer the better to the pan. Bake for 15 minutes until a toothpick comes out clean. 

Cool completely. Allow the cake to cool at room temperature.

Make the frosting. Place the heavy cream in a large bowl. Use an electric mixer and whip on high for 3 minutes until it starts to have soft peaks. Add the peanut butter and agave. Mix again and continue to whip for a couple more minutes until the frosting stiffens and turns into a whipped cream. 

Assemble the cake. Smooth the whipped frosting on top of the cake until it covers the top. Sprinkle with chopped walnuts or whatever fun toppings you’re using!

Chill and enjoy! Enjoy immediately or chill the cake for about an hour for the frosting to firm up a bit.

This is an overhead image of a view of a slice of oat flour cake. The cake is topped with a peanut butter whipped cream and crushed walnuts. The cake square sits on a white piece of parchment paper.

More banana recipes to try

  • Oat Flour Banana Bread
  • Chocolate Chip Tahini Banana Bread
  • Gluten Free Chocolate Chunk Banana Cake
  • Banana Chocolate Chip Bars
  • Banana Oatmeal Breakfast Cookies

Did you make this? Leave a review below and tag me on Instagram, Facebook, or Pinterest!

Recipe
GF Gluten-Free

30-Min Fluffy & Moist Banana Oat Flour Cake

Banana oat flour cake is super moist and decadent. It’s naturally gluten free and topped with a fluffy peanut butter whipped cream frosting!

AvatarRecipe by:Lindsay Grimes Freedman
Prep: 15 minCook: 15 minTotal: 30 min
Print recipe Rate recipe Pin Save recipe
Servings: 1 cake (12 slices) 1x

Ingredients

Banana Cake:

  • 3 ripe bananas (1 1/4 cup mashed banana)
  • 2 eggs
  • 1/4 cup agave nectar (honey or maple syrup)
  • 1 teaspoon vanilla extract
  • 1 cup oat flour (Kitchen Hack: How to Make Oat Flour)
  • 2 teaspoons baking powder
  • 1/2 teaspoon salt
  • walnuts for topping

Peanut Butter Frosting:

  • 1 pint heavy whipping cream
  • 1/4 cup natural peanut butter
  • 1/4 cup agave nectar (honey or maple syrup)

Instructions

  1. Preheat oven to 350F.
  2. Mash the bananas in a large bowl.
  3. Add the eggs, agave nectar, and vanilla.
  4. Whisk until combined.
  5. Add the oat flour, baking powder, and salt.
  6. Whisk again until combined. 
  7. Line an 8×8 or 9×9 square pan with parchment paper and transfer the batter to the pan.
  8. Bake for 15 minutes until a toothpick comes out clean. 
  9. Allow the cake to cool at room temperature.
  10. Place the heavy cream in a large bowl.
  11. Use an electric mixer and whip on high for 3 minutes until it starts to have soft peaks.
  12. Add the peanut butter and agave.
  13. Mix again and continue to whip for a couple more minutes until the frosting stiffens and turns into a whipped cream. 
  14. Smooth the whipped frosting on top of the cake and top with chopped walnuts. 
  15. Cut into 12 square slices.
  16. Enjoy immediately or chill the cake for about an hour for the frosting to firm up a bit.

Nutrition Info:

  • Serving Size: 1 slice
  • Calories: 401
  • Sugar: 19.6g
  • Sodium: 188mg
  • Fat: 28.1g
  • Saturated Fat: 15.1g
  • Unsaturated Fat: 0g
  • Trans Fat: 0g
  • Carbohydrates: 33.2g
  • Fiber: 2.3g
  • Protein: 6.9g
  • Cholesterol: 123mg
© The Toasted Pine Nut

Did you make this?

I love seeing what you made! Tag me on social @thetoastedpinenut

Rate recipe Tag me on Instagram
This is an overhead image of a view of a slice of oat flour cake. The cake is topped with a peanut butter whipped cream and crushed walnuts. The cake square sits on a white piece of parchment paper. Text overlay reads "oat flour banana cake with PB frosting!"
141 shares
  • Share
  • Tweet
  • Save
  • Email
overhead image of a gluten free sprinkle cookie with a bite taken out on a white counter

Never miss a recipe!

Join our pine nut family and get recipes delivered right to your inbox.

Join now!
15 no bake desserts

You May Also Like...

  • This is an overhead image of a slice of banana bread on a white piece of parchment paper. There are oats sprinkled around the bread. The full loaf is blurred at the bottom of this image.
    Moist & Fluffy Oat Flour Banana Bread
  • Gluten Free Chocolate Chunk Banana Cake
  • This is a side view of a stack of oat flour chocolate chip cookies. The stack of cookies sits on a white surface with a white background and some blurred cookies in the background.
    Oat Flour Chocolate Chip Cookies

Reader Interactions

Leave a Comment & Rate this Recipe Cancel reply

If you love this recipe it would mean SO MUCH to me if you give it a star rating and leave a comment about it. Not only do I love basking in the glory of your recipe love, but (perhaps more importantly 😋) it helps other readers find my recipes online. Thanks so much for your feedback!!

Have a question? Submit your question or comment below. Your email address will not be published. Required fields are marked *

Recipe rating ★☆ ★☆ ★☆ ★☆ ★☆

  1. AvatarAnna Krol says

    Posted on 7/1/21 at 9:35 am

    Hi. I looove your gf recipes but it’s been few months now I am not able to pin anything from your blog. Usually, I managed to just find recipes I wanted to pin on your Pinterest board but not this one, and I don’t really have time to go through all of your pins to find this one. I think it must be a bigger problem as I’ve noticed you don’t have many re-pins from the blog so it’s not just me I guess. I really hope you can fix it.
    Regards, Ania xx

    Reply
    • AvatarLindsay Grimes Freedman says

      Posted on 7/1/21 at 11:18 am

      Thanks so much for letting me know! I’m going to look into this asap! xo

      Reply
  2. AvatarJosephine says

    Posted on 12/26/21 at 12:58 am

    How about oil or butter? How much is needed for this recipe?

    Reply
    • AvatarLindsay Grimes Freedman says

      Posted on 1/6/22 at 10:54 am

      None! All the ingredients are in the recipe card 🙂

      Reply

Primary Sidebar

Lindsay

Hi Friend!

I'm Lindsay I love sharing simple, better-for-you recipes. When I'm not in the kitchen, you can find me at the beach watching my kids boogie board and soaking in that warm Cali sun (with sunscreen, of course).

Read more...

Recipe Key

GF Gluten-Free DF Dairy-Free V Vegan VG Vegetarian EF Egg-Free NF Nut-Free P Paleo Browse All

Most Popular

5-Min Crunchy Chocolate Quinoa Crisps

overhead image of a muffin tin filled with 12 raw eggs sprinkled with pepper

Perfect Oven-Baked Eggs in a Muffin Tin

This is a side view of a chocolate almond butter bar with a bite taken out of it. The bar sits on a white piece of parchment paper and is sprinkled with salt. More bars are blurred in the background.

No Bake Almond Butter Bars

Lemon + Avocado Kale Salad

Freebie alert!

Get My Free No Bake Desserts eBook!

Explore

More Cakes & Cupcakes

This is an overhead image of a muffin tin filled with individual cheesecakes topped with pecans. The muffin tin sits on a light surface.

Rich & Creamy Caramel Pecan Cheesecake Minis

This is an overhead image of a vanilla raspberry cake topped with vanilla icing and fresh raspberries. The cake sits on a white piece of parchment paper on a white counter. The images focuses on one sliced piece of cake laying on its side.

Light & Moist Summer Raspberry Cake with Oat Flour

This is an overhead image of a ramekin with baked oats. The blended baked oats are topped with a drizzle of peanut butter and sliced banana. The ramekin is on a white plate with an antique spoon with peanut butter on it. The plate sits on a light grey surface. Another ramekin with baked oats is in the top left corner of the image. A small white bowl of peanut butter and an open, sliced banana is in the top right corner of the image.

5-Min Fluffy Vegan Baked Oats

This is a side view of a vanilla cupcake with the liner peeled back. The cupcake sits on a light grey surface with more cupcakes blurred in the background. The cupcake is topped with vanilla frosting, light green coconut, and candy eggs.

30-Min Mini Easter Egg Cupcakes using Oat Flour

Browse All
15 No bake desserts

Download my FREE No Bake Dessert Ebook!

As seen on:

Food Network
Shape
Men's Health
NBC
Kitchn
Glamour
  • Browse by Diet
    • Gluten Free
    • Dairy Free
    • Vegan
    • Egg Free
    • Low Carb
    • Recipe Filter
  • Explore Resources
    • FAQ
    • My Baking Mixes
    • Cookbook
    • Shop Favorites
    • Web Stories
    • Meet Lindsay
Follow

@thetoastedpinenut

Accessibility

Privacy Policy

Disclaimer

Contact

© 2023 The Toasted Pine Nut
|
Site Credits Designed by Melissa Rose Design Developed by Once Coupled Support by Foodie Digital
Back to Top
141 shares