Frosted Peanut Butter Cake Bars

Yield: 24 bars

Frosted Peanut Butter Cake Bars

Frosted Peanut Butter Cake Bars Recipe

A peanut butter lovers dream! These cake bars are jam packed with peanut butter and milk chocolate chips, then topped off with peanut butter frosting too! Heaven.

Prep Time 25 minutes
Cook Time 45 minutes



  • 150g (β…” cup) butter, softened
  • 165g (β…” cup) peanut butter
  • 125g (1 cup) granulated sugar
  • 220g (1 cup) brown sugar, packed
  • 4 eggs
  • 2 tsp vanilla extract
  • 250g (2 cups) plain (all-purpose) flour, sifted
  • 2 tsp baking powder
  • Β½ tsp salt
  • 1 pack (approx. 11 oz) milk chocolate chips


  • 113g (Β½ cup) butter, softened
  • 250g (1 cup) peanut butter, smooth
  • 500g (4 cups) icing (confectioners’) sugar, sifted
  • 80ml (β…“ cup) single cream (half and half)


  1. Preheat the oven to 180°C, 350°F, gas mark 4, and grease a 13×9 inch baking pan.
  2. To make the cake bars, cream the butter, peanut butter, vanilla, and both sugars until fluffy. Add the eggs, one at a time, beating well after each addition. Add the flour, baking powder, salt and mix until just combined. Fold in the chocolate chips.
  3. Spread evenly into the baking pan and bake for 45-50 minutes, or until a toothpick inserted comes out clean. Allow to cool completely in the baking pan.
  4. To make the frosting, beat butter and peanut butter until light and fluffy. Then slowly beat in ½ of the icing sugar, add the cream or half and half then beat in the remaining icing sugar. If necessary, add a little more cream to reach speeding consistency.
  5. Spread the buttercream frosting evenly over the cooled bars and allow to set before cutting into bars.

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41 Comments on “Frosted Peanut Butter Cake Bars”

  1. HELEN β€” June 30, 2014 @9:55 pm Reply

    oh my goodness, why do I come over here - I get a sugar rush just looking! That frosting sounds amazing! I LOVE peanut butter!

    1. Lisa β€” July 2, 2014 @5:29 pm Reply

      Maybe because looking isn't as calorific as eating them all? :p

      Thanks for stopping by, Helen.

  2. Liz β€” July 1, 2014 @2:43 am Reply

    I have two kids that love peanut butter desserts! I know they'd go nuts for your bars!

    1. Lisa β€” July 2, 2014 @6:12 pm Reply

      My kids too. They went absolutely wild. Funny because before they tried this, they said they didn't like peanut butter (just by looking at it). Kids eh!

  3. Dorothy @ Crazy for Crust β€” July 1, 2014 @3:00 am Reply

    Oh I'm in love!!! These are amazing. Pinned!

    1. Lisa β€” July 4, 2014 @1:46 pm Reply

      Thanks for pinning, Dorothy. :)

  4. Medeja β€” July 1, 2014 @10:18 am Reply

    Delicious.. These bars look amazing :)

    1. Lisa β€” July 5, 2014 @10:02 pm Reply

      Thank you. :)

  5. The Partiologist β€” July 1, 2014 @2:33 pm Reply

    Since I can't reach into my screen and take a bar, I must make them, they sound amazingly full of peanut butter fluffiness - YUM!

    1. Lisa β€” July 5, 2014 @10:30 pm Reply

      Oh gosh they are Kim. Such a crowd pleaser, your family will love them.

      Thanks for stopping by.

  6. Zainab β€” July 1, 2014 @2:41 pm Reply

    I live with a peanut butter addict!!! Like serious needs rehab kind so he will love this cake!!! The frosting looks amazing and the moist chunks!!

    1. Lisa β€” July 6, 2014 @12:07 am Reply

      Oh no, have I created extra work for you since he'll adore this? Or is it a secret don't you don't have to churn out oven heat? :lol: So much PB in this, it'll probably send a PB addict crazy.

      Thanks for stopping by, Zainab.

  7. Jess @ whatjessicabakednext β€” July 1, 2014 @6:40 pm Reply

    These bars look amazing, Lisa! Love PB- so I've got to try these out!

    1. Lisa β€” July 6, 2014 @12:14 am Reply

      You'll love them! :) Thanks for stopping by, Jess.

  8. Sydney @ Tastefullyfrugal β€” July 1, 2014 @10:20 pm Reply

    Wow! These look so yummy!! And I just bought peanut butter at Costco... looks like I'll be making some of these very, very soon!

    1. Lisa β€” July 6, 2014 @12:19 am Reply

      Thanks Sydney. Do let me know how they turn out, and if you like them, of course. :)

      Thanks for stopping by.

  9. Choc Chip Uru β€” July 2, 2014 @12:33 am Reply

    What a delicious peanut butter cake recipe :D
    I would eat these bars forever!

    Choc Chip Uru

    1. Lisa β€” July 6, 2014 @12:35 am Reply

      Me too. Thanks for stopping by.

  10. Kathleen R. β€” July 2, 2014 @1:56 am Reply

    Yum!! Peanut butter cake AND peanut butter frosting?! I'm all over this :)

    1. Lisa β€” July 6, 2014 @12:42 am Reply

      Hehe, you'll love them. Thanks for stopping by.

  11. Kayle (The Cooking Actress) β€” July 2, 2014 @2:01 am Reply

    yesyesyesss I LOVE PEANUT BUTTER!!! These cake bars are suuuuper delish looking!

    1. Lisa β€” July 6, 2014 @12:47 am Reply

      Thanks Kayle.

  12. Healing Tomato β€” July 2, 2014 @3:06 am Reply

    I Love this wonderful recipe. Your pics are so well done. Thank you for sharing the recipe.

    1. Lisa β€” July 6, 2014 @12:54 am Reply

      Thank you. :) Thanks for stopping by.

      Hope you're having a great weekend.

  13. Ella-HomeCookingAdventure β€” July 2, 2014 @12:44 pm Reply

    Absolutely heavenly. I need to buy Peanut Butter. It's a must now.

    1. Lisa β€” July 6, 2014 @12:57 am Reply

      Most definitely. :) Thanks for stopping by.

  14. Laura Dembowski β€” July 2, 2014 @1:29 pm Reply

    I'm a peanut butter addict! These cake bars look so yummy! I don't think I'd be able to stop eating them.

    1. Lisa β€” July 6, 2014 @1:07 am Reply

      The peanut addict in you will love these, Laura. And yup, that's exactly what my kids did, ate them all. I only had one! *sulk*

      Thanks for stopping by.

  15. Jessica @ A Kitchen Addiction β€” July 2, 2014 @5:10 pm Reply

    I can't turn down a peanut butter dessert! Love all of the pb you packed into these bars!

    1. Lisa β€” July 6, 2014 @1:15 am Reply

      Me too! Thanks for stopping by.

  16. Jess @ On Sugar Mountain β€” July 2, 2014 @8:53 pm Reply

    Ok please don't judge me but...I don't dig peanut butter. (gasps) I know I know. I'm weird. I totally admit to it. But you know who would go gaga over these cake bars? Pretty much everyone I know. So I shall make these amazing-looking bars and share them and make up for my inability to enjoy pb heehee. :)

  17. Jocelyn@Brucrewlife β€” July 7, 2014 @5:57 am Reply

    These are totally calling to me!! I puffy heart love everything about them! :)

  18. Brenna @ Life After Laundry β€” July 7, 2014 @10:32 pm Reply

    These look amazing. I need to make them like now. Thanks for sharing with this weeks Tips and Tricks link party.

  19. Kelly β€” July 8, 2014 @4:22 am Reply

    I love these jam packed peanut butter bars Lisa! They look amazing! And the frosting is totally calling my name! Pinning!

  20. Jessica @ Sweet Menu β€” July 9, 2014 @4:59 am Reply

    Oh boy! I could gobble one of this up right now - they look fantastic!

  21. Sydney @ Tastefullyfrugal β€” July 10, 2014 @5:45 pm Reply

    Oh my these look fantastic! And super easy to make! I think I'll be trying these this weekend!

  22. dina β€” July 11, 2014 @2:05 pm Reply

    i love peanut butter. these look great!


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