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!

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
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  • 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. Lori

    I made these last night and they were a HIT at our house! My dd (11) who doesn’t like sweet treats asked for seconds. 6 out of 6 LOVED them!! Thank you! I didn’t have a cake mix on hand (unusual for me…) so I used my go-to recipe for a yellow cake mix:
    2 cups cake flour (I have used all purpose flour and it has worked)
    2 1/2 teaspoons baking powder
    1 teaspoon salt
    1 1/4 cups sugar
    1/2 cup vegetable shortening (I only use Crisco)

    Thank you for a new favorite dessert for my family!! 🙂

  2. Sharalee

    These are amazing!! I love peanut butter fudge and the center of these bars tastes just like fudge.

  3. Amanda

    I made these last night. The recipe was perfect and they are so, so good! I cut off the edges before making pretty squares, and am enjoying the crusts with my morning coffee.

  4. Kimberly Rose

    I have these in the oven right now… I didn’t have any white chocolate chips so I substituted peanut butter chips… I hope they turn out okay.

  5. jessie

    i just made these the other day and they were awesome! thanks so much for all the great recipes 🙂

  6. Cheryl Kelley

    These were a big hit in our house! My 9 y.o. suggested that next time, we should use a chocolate cake mix and substitute Nutella for the peanut butter and see how it tastes! I think he is on to something!

  7. Tom

    Made these twice to take to 2 BBQs over 4th of July weekend and they were amazing! Your instructions were perfect and they came out looking exactly like your pics. A huge hit with young and old alike! Thank you thank you thank you!!!

  8. Carolinachef

    I made these the other day and, although tasty, they did not set up well at all. I also ended up with twice as much as the recipe said I would. I am not sure if I did something wrong or if the recipe just didn’t work as planned. I’ll try again though, but maybe with a shortbread crust instead of the cake.

  9. Tracy

    I am planning on making these for a BBQ on Sunday. How far in advance is it safe to make them? I was planning on doing them tonight, since I have time and I’m baking something else for tomorrow night. If I keep them air tight in the fridge uncut, will they be okay for Sunday? They need to travel in the car about two hours as well. Thanks!

  10. Monica

    Hi Jenny – I made these last weekend for a BBQ and they were a HUGE hit! Needless to say, you have many new fans 🙂 Thanks for the great recipe.

  11. Pedey @ Do You Smell That

    Made these last night – fantastic. I didn’t realize the PB/mallow mixture would stay so soft, so they were a little messier than I anticipated, but they were still delicious! Shared them with 2 different neighbors and got thumbs up all around!

  12. Lindsay

    Yum! I just made these with a few changes. I halved the recipe in a square pan (still used 1 egg). I used chocolate cake mix and chocolate chips because that’s what I had on hand. I think next time it would be good to add some PB chips, too. Thanks for the great recipe!

  13. Mrs. L

    I’m pretty much addicted to anything that is “gooey cake bars”, but this? This is just over the top and I can’t wait to make them!

  14. Pedey @ Do You Smell That

    Oh, good Heavens, Jenny! These look fantastic! I’m in charge of teacher appreciation this month at church – I need a special something for them tomorrow & I just found what it will be! Thanks for your post!

  15. danielle

    Yum! I cant wait to try this. I wanted to let you know that I featured this recipe in my “What I Bookmarked This Week” post today – stop by and see.

  16. Melissa

    My daughter loves fluffernutter sandwiches…I just made these for a pool party she is hosting this weekend. They are very yummy!!

  17. Kayla

    The recipe calls for unsalted, but I think the butter shown is salted? Yes, no? Will it change the consistency or just taste?

  18. Tamara Bennett

    Just got back from walmart, picked up the things i need. I’m resisting the urge to make these RIGHT NOW. LOL. I’m going to make them for a family reunion tomorrow. I know if i make them now, I’ll probably eat them all. LOL. Thank you! My mom and I are totally addicted to your blog! You have been our “go to gal” for great new recipes that are sure to wow a crowd!


  19. Allison @ Bake Like Martha

    Ahhhhh, white chocolate during the summer. So awesome! It’s nice to have some light flavors that don’t weigh you down.AND there’s peanut butter, so I’m officially won over.

    By the way, your nails are so cute.

  20. Melanie

    Made these last night with my daughter and my oh my they are amazing!!!!!! Love your recipes

  21. Donna

    Small can of Sweet Cond. Milk? Actual ounce Size?- there were 3 different sizes on the grocery shelf.

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