Gooey White Chocolate Fluffernutter Cake Bars

These Gooey White Chocolate Fluffernutter Cake Bars are a sweet and delicious dessert bar filled with peanut butter, gooey marshmallow and white chocolate. They’re terrific!

Image of Gooey White Chocolate Fluffernutter Cake Bars

White Chocolate Fluffernutter Gooey Bars

Ahhh, summer is officially here which means more fun time to cook with the kids. My Gooey cake bars are so simple (not to mention ridiculously delish) and the kids absolutely love to get their hands dirty to help with this one.

My favorite part about these bars is the gooey fluffernutter topping, its almost caramel like consistency which makes for a perfect gooey treat. They travel well so they’re perfect for bake sales, family picnics and parties.

Whatcha waiting for, get baking! PS, if you can even believe it my kids are still in school! …no pics of them helping me until after this week, lol!

Image of Ingredients for Gooey White Chocolate Fluffernutter Cake Bars

How to Make Gooey Peanut Butter Cake Bars

Line up: Yellow cake mix, egg, butter, marshmallow creme, peanut butter, sweetened condensed milk and white chocolate chips.

Image of Pouring Cake Mix in a BowlAdd your cake mix to a large bowl.

Image of Adding Egg to Cake MixAdd a pretty little egg.

Image of Adding Butter to Cake Mix…and a softened stick of butter.

Image of Cake Mix Dough in a BowlMix, mix and mix. You can do this with your stand mixer or use your hands to get a dough like this.

Image of Cake Mix DoughPress into a 9×13 inch baking pan. I like lining with foil so after it cools, I can pull the whole sheet out and cut into perfect little squares. Do you like my Sally Hansen sticker nails?! Lol. I like them but do not like that they only last about 4 days 🙂  Cute though!

Image of Cake Bar Layer OnePress evenly throughout.Image of Making Fluffernutter CremeTime for the gooey fluffernutter topping. Place your peanut butter, marshmallow creme and sweetened condensed milk into a large bowl, mixing to combine. This is what turns caramel-like once baked. Mmmmm!Image of Fluffernutter CremePour it over your pressed crust. Definitely lick the spoon, it’s worth it 🙂

Image of White Chocolate ChipsPour  a nice bag of white chocolate chips over top and bake 350 degrees F. for 23-25 minutes. Let cool completely and….

Close-up Image of a Stack of Gooey White Chocolate Fluffernutter Cake BarsWhat you’ll find are these gooey bars of deliciousness! Perfect for any occasion, Enjoy friends!

Image of Gooey White Chocolate Fluffernutter Cake Bars Piled on a Plate

Close-up Image of Gooey White Chocolate Fluffernutter Cake Bars 

Gooey White Chocolate Fluffernutter Cake Bars

These Gooey White Chocolate Fluffernutter Cake Bars are a sweet and delicious dessert bar filled with peanut butter, gooey marshmallow and white chocolate. They're terrific!
Course: Dessert
Cuisine: American
Prep Time 10 minutes
Cook Time 24 minutes
Total Time 34 minutes
Servings: 12 bars
Calories: 570kcal
Author: Jenny
Print Pin


  • Oven


  • 1 box yellow cake mix
  • 1 large egg
  • 8 tbsp unsalted butter softened
  • 1/2 cup creamy peanut butter
  • 1/2 cup marshmallow fluff
  • 14 oz can sweetened condensed milk
  • 12 oz bag white chocolate chips


  • Place cake mix, egg, and butter into a large bowl. Mix until well combined, will be the consistency of thick cookie dough. I used my hands towards the ends. Press dough into prepared baking pan.
  • Place peanut butter, marshmallow creme and condensed milk into a large bowl and mix until well combined. Pour over crust then top with white chips.
  • Bake for 23-25 minutes, until cooked through. Center will seem somewhat jiggly, but will set up while cools.
  • Let cool completely, cut into squares and serve.


Calories: 570kcal | Carbohydrates: 77g | Protein: 9g | Fat: 27g | Saturated Fat: 14g | Cholesterol: 51mg | Sodium: 437mg | Potassium: 299mg | Fiber: 1g | Sugar: 58g | Vitamin A: 353IU | Vitamin C: 1mg | Calcium: 250mg | Iron: 1mg
Keywords: cake bars, cake mix recipe, dessert bars recipe, easy dessert recipe, marshmallow dessert, peanut butter bars recipe, peanut butter dessert


Have a great rest of your week and weekend! Come back soon 🙂

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96 Responses
  1. Julie Thoren

    I use chopped Reese’s Peanut Butter Cups instead of the white chocolate chips on top and it is AMAZING!!

  2. Brittany

    my husband and i are waiting for these to cool right now. I’m tempted to just grab a fork right now lolol

    thanks for the deelish recipe 🙂

  3. Shephalli

    The recipe looks amazing. Question – can i skip the peanut butter for people that are allergic? What should i replace it with instead?

  4. sarah@spinach and spice

    I commented before, but I have to update you..
    These are my 86 year old grandpa’s favorite dessert HANDS DOWN.
    (And we’re trying to get him to put on weight, so honestly.. this recipe is a blessing!)
    It’s adorable, he truly loves them. I’m making my third batch now!
    Thank you thank you for such a delicious recipe!

  5. sarah@spinach and spice

    OHMYGAHHH these are so good! My family is going crazy for them.. I made them this afternoon and they want another batch made for tomorrow!

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