Beyond Frosting » Recipes » Desserts » Brownies and Bars » Peanut Butter Cake Bars

Peanut Butter Cake Bars

These Peanut Butter Cake Bars start with a boxed chocolate cake mix, so they’re easy to whip up! They’re rich, chocolatey, and irresistible!

five cake bars stacked

Does anyone recall my love for Jif Whips? I made this Whipped Chocolate Peanut Butter Frosting and immediately posted it the following day. Jif Whips are what I call a “yellow light food”- which means I need to approach it cautiously, because overindulgence is absolutely going to happen. So I first used it in a frosting and now I am using it for a Peanut Butter Cake Bar.

three peanut butter cake bars stacked with parchment paper between each

I adapted this recipe from one of my favorite bloggers, Dorothy at Crazy For Crust. She did a brownie version of this bar.

a peanut butter cake bar on a piece of parchment paper with a bite taken out

I changed it up using a cake mix base, added some Jif Whips and used crumbled brownies on top. The crumbled brownies were really just a way for me to allow myself to finish the brownies left over from the previous project. 

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closeup of five peanut butter cake bars stacked

Peanut Butter Cake Bars

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  • Author: Julianne Dell
  • Prep Time: 20 minutes
  • Cook Time: 22 minutes
  • Total Time: 42 minutes
  • Yield: 12-15 bars
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


These Peanut Butter Cake Bars start with a boxed chocolate cake mix, so they’re easy to whip up!


  • 1 Box Chocolate cake mix
  • 1/2 cup unsalted butter, softened
  • 3/4 cup Jif Chocolate Whips
  • 1 Large eggs
  • 3/4 cup Milk chocolate chips
  • 3/4 cup Reese peanut butter chips
  • 1 Package Reese’s mini peanut butter cups
  • 2 cups Brownie crumbs
  • 1 Can Sweetened condensed milk


  1. Preheat oven to 350 degrees.
  2. In a large bowl, combine cake mix, butter, Jif Whips and eggs. Beat on medium speed until smooth. Mixture should be somewhat dough-like.
  3. Gently pat into the bottom of a 9 x 13″ pan.
  4. Top with chocolate and peanut butter chips, followed by Reese’s peanut butter cups and then crumbled brownies.
  5. Pour can of condensed milk over top of bars.
  6. Bake at 350 degrees for 20-24 minutes until the top starts to turn golden brown. Baking times will vary by oven. Allow bars to cool completely before cutting. Store in an airtight container.


Recipe adapted from Crazy for Crust

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27 thoughts on “Peanut Butter Cake Bars”

  1. Avatar photo
    Krista @ joyfulhealthyeats

    Chocolate… peanut butter.. cake. I’m sold! This looks amazing and pretty sure it has some delicious components to it. Thanks for sharing at Show Stopper Saturdays

  2. Avatar photo
    Roxana | Roxana's Home Baking

    Jif Whips can become addictive in no time, and I’m saying this rom my own experience! And these bars, I have the feeling I could eat the whole pan all by myself!

  3. Avatar photo
    The Domestic Rebel

    That Jif whips stuff is GOOD %@^#$^ STUFF. I want to live in there and also live inside of these pictures with these bars. HOLY MOLY.

  4. Avatar photo
    Erin | The Emerging Foodie

    Wow! Never heard of Jif Whips but I think I might need to investigate! Treading cautiously, of course. 🙂 These look amazing!

  5. These look incredible! My mouth is watering for one.

    I’d love to have you share this or any of your amazing posts at our weekly Super Saturday Link Party. It starts Friday’s at 6pm, hope we see you there!


  6. Avatar photo

    I’ve never heard of Jif whips before and now I’m scared because it sounds like something I want to eat all the time. Just like these delicious cake bars!

  7. Avatar photo
    Gloria Phillips (@simplygloria1)

    I wish I had some right now! I love using cake mixes for other sweet treats besides cakes. You make these look amazing! Pinning!

  8. Avatar photo
    Cathy Pollak ~ Noble Pig

    This is truly an inspired dessert. I haven’t tried Jif Whips yet but next time I see it I am picking some up. Pinned.

    1. Avatar photo

      Hi Cathy! Beware, it is deliciously addicting! But the perfect consistency for baking and eating with a spoon! Think light and fluffy.