Bars, Blondies & Brownies

Fluffernutter Bars

Fluffer what?!  Fluffernutter!  Peanut butter cookie bars, full of mini marshmallows, mallow bits, chopped peanut butter cups and semi sweet chocolate chips.  Soft, gooey cookie bars…and did I mention these are made with peanut butter, marshmallows and chocolate?!  People flip out over these every time I make them, but I realized I didn’t have the recipe on the blog yet.  So I fixed that 🙂

This recipe makes a lot, is easy to make and they stay soft for days!  Perfect for bake sales, parties, late night snacking…or just because!  And like I said before….people LOVE these.  So much in fact, instead of a wedding cake, one of my friends asked me to make these Fluffernutter bars as the dessert for their wedding.

Fluffernutter Bars

Print Recipe
Serves: 30 Cooking Time: 20-Minutes


  • 1 cup unsalted butter, room temperature
  • 3/4 cup creamy peanut butter
  • 1 cup light brown sugar
  • 1/2 cup white granulated sugar
  • 1 teaspoon vanilla extract
  • 2 eggs, room temperature
  • pinch of salt
  • 2-1/4 cups all-purpose flour
  • 1 teaspoon baking soda
  • 1-1/2 cups mini marshmallows
  • 1/2 cup mallow bits (can use mini marshmallows instead)
  • 1/2 cup semi-sweet chocolate chips
  • 2 cups chopped peanut butter cup pieces
  • 1 tablespoon raw sugar



Preheat oven to 350-degrees. Line a 9x13-inch pan with foil and spray the bottom and sides of the pan with baking spray. Set aside.


In the bowl of a stand mixer, affixed with the paddle attachment, add the butter and beat on medium-high speed until pale and glossy. Add the peanut butter to the butter and mix until combined. Scrape down the sides of the bowl as needed. Add the brown sugar and white sugar to the butter mixture and mix on medium-high speed until light and fluffy. Add the eggs to the mixture, one at a time, mixing the first egg into the mixture fully, before adding the second egg. Mix in the vanilla extract.


Change the mixer speed to low and slowly add the salt, flour and baking soda to the bowl. Mix until just combined. With the mixer on the lowest setting, add the marshmallows, mallow bits, chopped peanut butter cup pieces and chocolate chips. Mix until just combined.


Remove the bowl from the mixer and pour the cookie dough batter into the prepared pan. Press dough so it is evenly distributed in the pan. Sprinkle the raw sugar evenly over the top of the dough.


Bake bars in 350-degree oven for 20-minutes. Bars may look underdone, but they will continue baking in the pan once removed from the oven.


Let bars cool in the pan completely, before removing bars from the pan and cutting into desired sized squares.


Store in an airtight container at room temperature. Bars will stay fresh for 7-10 days.

Isn’t this container the cutest?!  My sister bought it for me for Christmas last year 🙂 I made a batch of these bars to take into work…so of course I had to put them in my super cute container!

This recipe would be perfect for cookie exchanges or holiday parties.  It can be made a few days in advance too, because these Fluffernutter Bars stay soft for days!  Definitely pin this recipe and share on Facebook…and then run to the kitchen to make these.  You won’t be sorry!



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  • Reply
    Milena | Craft Beering
    November 28, 2017 at 8:49 AM

    I can’t say that I’d hear of a ‘fluffernut’ before, but seeing these bars I am sooo sold! They would go perfect with some coffee or hot cocoa after a day of skiing. The dreams I have for snow this time of year:) Pinned!

    • Reply
      November 29, 2017 at 6:00 AM

      Thanks Milena! It’s “fluffer” for the marshmallows and “nutter” for the peanut butter. It’s just a fun word hahaha. But these are sooooo good! You definitely need to make these on a snowy day 🙂

  • Reply
    Kim | The Baking ChocolaTess
    November 28, 2017 at 9:19 AM

    I could eat these everyday! All of my favorite things in the world!! They look so decadent!!

    • Reply
      November 29, 2017 at 6:02 AM

      Thanks Kim! I could too hehehe. I could eat these until I get sick. Probably why I try to give them all away as soon as I make them 🙂 XOXO

  • Reply
    Sandra Garth
    November 28, 2017 at 11:09 AM

    I am going to enjoy every single calorie without guilt. There’s nothing better than a soft and gooey bar filled with my favorite things!

    • Reply
      November 29, 2017 at 6:03 AM

      Thanks Sandra!! These are definitely to be enjoyed! Calories don’t count during the holidays right? Or maybe that’s why we have stretchy pants hehehe 🙂 XOXO

  • Reply
    Katherine | Love In My Oven
    November 28, 2017 at 9:16 PM

    That container is just adorable Kelly!! Your nieces are so cute. These look SO good!!!

    • Reply
      November 29, 2017 at 6:03 AM

      Thanks Katherine! I love my container and my nieces 🙂 And these bars are YUMMY! 🙂 XOXO

  • Reply
    November 29, 2017 at 12:03 AM

    Is there a substitute that can be used for the raw sugar in this recipe?

    • Reply
      November 29, 2017 at 6:07 AM

      Hi Sandy! Thanks for checking this recipe out 🙂 You can substitute the raw sugar for sparkling sugar or sanding sugar (the sugar crystal sprinkles). I was just trying to mimic the how peanut butter cookies are rolled in sugar and wanted a little crunch on top. If nothing else, you could just use good ol’ granulated sugar! 🙂

  • Reply
    Amy (Savory Moments)
    November 29, 2017 at 7:36 AM

    Oh man!! These looks amazingly yummy and decadent!! I love that your friend requested them for her wedding!

    • Reply
      December 1, 2017 at 7:40 AM

      Thank you Amy! And they were a HIT at the wedding! Everyone loved them. Plus it was so much easier for me to make than a huge ol’ wedding cake hehehe 😉

  • Reply
    Shannon @loveatfirstbento
    November 29, 2017 at 7:48 AM

    OMG, I need these in my life ASAP! These bars are literally filled with all of my guilty pleasures, so making these is not an option for me, but a necessity! Bookmarking to bake with my sister the next time she visits, as I know she’ll love them too 🙂

    • Reply
      December 1, 2017 at 7:42 AM

      Awww! Thank you! I hope you and your sister make these! Let me know what you think 🙂 XOXO

  • Reply
    Kelsie | the itsy-bitsy kitchen
    November 29, 2017 at 8:54 AM

    Whoa! I need to make these ASAP. My family would go nuts for them!

    • Reply
      December 1, 2017 at 7:42 AM

      Thanks Kelsie! So easy to make! I know your family would LOVE them 🙂

  • Reply
    heather (delicious not gorgeous)
    November 29, 2017 at 2:40 PM

    these sound so tasty!!! the first time i had a fluffernutter sandwich as a kid, i was mindblown that my friend was even allowed to eat such a sandwich (my parents only exposed me to sandwiches with plenty of veggies lol).

    • Reply
      December 1, 2017 at 7:43 AM

      HAHAHA! I love it! Now you got me wanting to make a fluffernutter sandwich! I might need to run to the kitchen…hehehe 🙂

  • Reply
    November 30, 2017 at 7:56 AM

    These fluffernutter bars sound and look fantastic! I love the container too – that is so cute. These bars sound like a great wedding treat to me. Thank you for sharing this recipe. This one is definitely one that I am going to have to try.

    • Reply
      December 1, 2017 at 7:44 AM

      Thanks Amy! I hope you try this! Let me know what you think, if you do! These are soooooo yummy 🙂

  • Reply
    Maria Doss
    November 30, 2017 at 8:40 PM

    That container is so darn cute Kelly, totally love it. These bars have all my favorite things in one bite and it looks so soft too, yum!

    • Reply
      December 1, 2017 at 7:45 AM

      Thanks Maria! My sister finds the cutest, original presents for me. I definitely treasure that container 🙂 And the treats are yummy too hehehe

  • Reply
    December 5, 2017 at 3:59 AM

    So super yummy looking and I agree, the tin is adorable!

    • Reply
      December 6, 2017 at 5:50 AM

      Thank you Colleen! These are definitely a favorite of mine and a go-to recipe 🙂 And my tin just makes me smile 🙂 XOXO

  • Reply
    Janice Thomas
    December 5, 2017 at 7:01 AM

    I can’t wait to try these! Adding them to our must try list! Celebrate 365 #cookieexchange is glad you joined in!

  • Reply
    December 8, 2017 at 5:27 AM

    I make my daughter a fluffer-nutter sandwich every day for school- she would absolutely LOVE these! Great idea!

    • Reply
      December 9, 2017 at 6:50 AM

      Lucky daughter! She must be the envy of every kid who is pulling out a boring ham sandwich for lunch! Your daughter would definitely love these bars 🙂 XOXO

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