Butterscotch Peanut Butter Cake

filed under: Cakes on March 28, 2012

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.

5 from 4 votes
butterscotch cake
Peanut Butter Cake with Butterscotch Topping
Prep Time
20 mins
Cook Time
35 mins
Total Time
55 mins

I love butterscotch. I love cake. And that is the inspiration for this Butterscotch Peanut Butter Cake!

Course: Dessert
Cuisine: American
Keyword: peanut butter cake
Servings: 8 people
Author: Amanda Rettke
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
  1. 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. 
  2. In a separate bowl, sift together flour, baking powder, baking soda, and salt.
  3. 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.
  4. Bake in two prepared 9-inch round cake pans at 350°F for 25-35 minutes.

Butterscotch Topping
  1. Melt butter and peanut butter in medium saucepan over medium-low heat. 

  2. 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.

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

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  • Amt says:

    are you kidding me!!!! that looks like the most amazing cake ever! making me drool!

  • Katrina @ Warm Vanilla Sugar says:

    You made this because of a craving?!?! Ahh!! So yummy!

  • DessertForTwo says:

    I want this in my face, too!

  • Elizabeth Ann says:

    OH my word! 🙂 That looks AMAZING!!!!!!!!!!!!!!!!!!!!!!!!

  • heather says:

    Oh. My. Gah….

  • Brenda @ a farmgirl's dabbles says:

    Ohhhhhhh, you’re killin’ me. This looks amazing!!

  • Zee says:

    This cake looks amazing!

  • Sylvie @ Gourmande in the Kitchen says:

    Now this is the kind of cake that dreams are made off!

  • Natalie @ Cooking for My Kids says:

    You are seriously crazy talented. And, those photos are just beautiful. Truly.

  • Angela @lesgetbaking says:

    wow! that cake is just amazing, such a yummy combination too!

  • kareno says:

    Sounds good to me!! I am a great fan of peanut butter and butterscotch is just too good. Thanks for another delicious cake. Yum!

  • Elizabeth Branch says:

    I never would have thought to combine beanut butter and butterscotch, but I like them seperately, and combining them sounds so good! I might have to try this recipe soon, maybe a cupcake version. 🙂

  • Cupcake and Talk says:

    This cake looks so yummy. I like that you made a mess. It’s more fun that way, sometimes. Messes can be cleaned up. I like the idea of drizzling the butterscotch sauce on the slice of cake. I love it, love it.

  • aida mollenkamp says:

    Oh, my, that looks like such a delicious mess of a cake!

  • aida mollenkamp says:

    Oh, my, that looks like such a gorgeous, delicious mess of a cake!

  • marla says:

    Oh Amanda, this craving very much works for me too!

  • Paula says:

    Pure decadence and I love it!

  • Mary says:

    Hi! I REALLY want to make this cake very soon — like in 5 minutes! My question: how much butter goes into the cake itself? Is it 1 1/2 sticks?


  • Mary says:

    I tried to post this question earlier, but I don’t think I was successful. I apologize if I end up double-posting. I’d like to make this cake right now — tonight! For the cake, is it 1 1/2 STICKS of butter?

    • Amanda says:

      Yes!! I know. I apologize in advance.

  • Kathleen says:

    In the cake part of the recipe you say 1 1/2 unsalted butter. Is that cups? Sticks? Thanks!

  • Katrina @ In Katrina's Kitchen says:

    I literally gasped when I opened up this page. I want to be fed this on my death bed. Morbid but true.

  • haniela says:

    I have a plate ready and I’m waiting for the cake to magically appear. 🙂

    • Amanda says:

      lol I wish I could bring you a piece! 🙂

  • Jessi says:

    Let me just say WOW! Must make now =)

  • naomi says:

    Um, yes, yes, and yes! Holy wow, Amanda, great cake! Pinned. 🙂

  • Emily (New York) says:

    This look so sweet and delicious, jst looking at it is making my teeth hurt (in a good way, of course! Lots of yummy sweets!) I’ll eat it allll please!