I love butterscotch.  I love cake.  And that is the inspiration for this Butterscotch Peanut Butter Cake! If you want more Cake Recipes, I’ve got you covered.

Peanut Butter Cake

I made a peanut butter cake.  It’s a GOOD peanut butter cake! Soft and moist and full of peanut butter. The ingredients are simple:

  • butter
  • chunky peanut butter
  • vanilla extract
  • eggs brown sugar
  • flour
  • baking powder
  • baking soda
  • salt
  • buttermilk

All of that sugar and buttermilk and eggs guarantee that you will have a moist and flavor-packed Peanut Butter Cake! These are BIG layers of cake. You could also make this is 3-layer cake using the same 9-inch cale pans. Just make sure to evenly disperse the batter between the pans. You will also want to check baking time to make sure they are not over-baked.

How to Make a Butterscotch Peanut Butter Cake

Bake cakes and let them cool.  Place one cake on cake stand and spread an entire 7ounce jar of marshmallow fluff.  Place the other layer on top.  Marshmallow will ooze out the sides.

This is good.  Very good.

Next, make the butterscotch sauce. (recipe below)

Put a thin layer of the sauce on top of the cake.  (This is to help the mini marshmallows to stay in place) Then disperse mini marshmallows all over the top of the cake.  (I used about half a bag)

Pour more sauce over cake.  Now, at this point in the picture, I had poured about half the mixture.  This is plenty for the cake.  The remaining mixture you can put in an 8×8 pan and make butterscotch bars! (Just make sure you mix in the remaining marshmallows first)

I highly recommend you do that instead.  Or you could just half the recipe.  I mean, whatever works for you.

But I did not do that.

I kept pouring.  And scooping out the chunky bits.  And pouring.  And I made a HUGE mess.

I just couldn’t stop.

Don’t be like me.

But do grab some of those butterscotchy peanut butter chunky bits from the bottom of the pan and spoon them over the top of your cake.

Then, out of seemingly nowhere,  I had visions of butterscotch hot chocolate with mini marshmallows but did not want to do that if it was 75 degrees outside.  Maybe on the next nice cool day, I could.  And then the temperatures went from 75 to 30 in one day and I actually made myself hot cocoa.  And then I felt bad and figured I caused the cold temperatures so I didn’t tell anyone.  Except now I am telling you.  Don’t be mad.  It will get warm again.  I think.  I mean, I can’t say for sure.  I live in Minnesota.  We are known for weird weather.  So yeah.

Moving on.

butterscotch cake
5 from 4 votes

Peanut Butter Cake with Butterscotch Topping

Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
I love butterscotch. I love cake. And that is the inspiration for this Butterscotch Peanut Butter Cake!


Peanut Butter Cake

  • 3/4 cup (12 tablespoons) unsalted butter, room temperature
  • 1 cup chunky peanut butter
  • 1 tsp. vanilla extract
  • 4 large eggs, room temperature
  • 3 cups brown sugar
  • 2 1/2 cups all purpose flour
  • 1 tsp. baking powder
  • 1 tsp. baking soda
  • 1/2 tsp. salt
  • 1 cup buttermilk

Butterscotch Topping

  • 1/2 c chunky peanut butter
  • 1 1/2 sticks butter
  • 1 1/2 bags 11 oz butterscotch chips


Peanut Butter Cake

  • In the bowl of a stand mixer with paddle attachment, cream together room temperature butter, peanut butter, vanilla, eggs (one at a time) and brown sugar in mixer. 
  • In a separate bowl, sift together flour, baking powder, baking soda, and salt.
  • Add the flour mixture to the sugar mixture, alternating with buttermilk. As in, add 1/3 flour mixture then 1/2 cup of buttermilk, another 1/3 of the flour mixture, remaining buttermilk, then remaining flour.
  • Bake in two prepared 9-inch round cake pans at 350°F for 25-35 minutes.

Butterscotch Topping

  • Melt butter and peanut butter in medium saucepan over medium-low heat. 
  • Once they are fully melted and combined, add in butterscotch chips. Stir continually until mostly melted. There will be chunks in the bottom of the pan, this is ok.

Did you make this recipe?

Thank you for making my recipe! You took pictures, right? Well go ahead and post them on Instagram! Be sure to mention me @iambaker and use the hashtag #YouAreBaker.

Or save some of that awesome sauce and drizzle it over a slice.  I wish I could say that I had thought of that before pouring rich thick butterscotch sauce all over my white linens and table.

Did I mention I made a big mess?

It was sorta worth it.  This cake is delicious.

You may also like these amazing cakes:

Best Chocolate Cake

Mint Chocolate Cake

Cream Cheese Pound Cake

Share with your friends!

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Meet Amanda Rettke

Amanda Rettke is the creator of I Am Baker, and the bestselling author of Surprise Inside Cakes: Amazing Cakes for Every Occasion – With a Little Something Extra Inside.Over the course of her 15+ year blogging adventure, she has been featured in and collaborated with the Food Network, New York Times, LA Times, Country Living Magazine, People Magazine, Epicurious, Brides, Romantic Homes, life:beautiful, Publishers Weekly, The Daily Mail, Star Tribune, The Globe and Mail, DailyCandy, YumSugar, The Knot, The Kitchn, and Parade, to name a few.

Reader Comments

  1. I just found your site from Pioneer Woman and THIS…. there are no words for… So excited to make this, but even more excited to eat it!

  2. Took out my pans as soon as got the post…..yum. Question though .here in Greece we only have butterscotch sweets or I found caramel droplets ..would I get the same effect with the caramel …or nestle Caramel treat dairy dessert filling and topping ( from s. Africa ) ? Thanks

  3. I made this cake for the first time for Thanksgiving and it was a big success! I never knew that peanut butter and butterscotch could taste so good together!

  4. I had to attempt this cake recipe twice. The first time I used 2 pans and there was way too much batter. It overflowed and left my house full of smoke. Also, the center fell. Both cakes went into the trash. I attempted it again and used 3 pans. Much better fit. However, these also fell in the center.

  5. I’d love to make this butterscotch peanut butter cake for my family New Year morning. Do you think it would be possible to make this the 30y, let it cool and then seal up and then reheat New Year?

  6. Wow this is amazing. I love to make this butterscotch peanut butter cake for my family and my wife and son loves it. Thanks for sharing.

  7. It looks so wonderful and tasty, well i was thinking to make something special during the weekend but now I am sure what to make in the weekend to make it special. thanks to you i was able to learn this awesome recipe

  8. Absolutely love your creative idea with butterscotch peanut butter cake! Never seen something like this! Thanks in advance and also for sharing 🙂

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