Fluffernutter Rice Krispie Treats

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Peanut Butter Rice Krispie Treats topped with melted Reese’s PB morsels and mini Reese’s PB cups. A delicious twist on a childhood favorite!

Rice Krispie Treats are our specialty here. Have you tried my new Pumpkin Pie Rice Krispie Treats yet? Or give our Fruity Pebbles Treats a try next!

Peanut butter rice krispie treats topped with reese's peanut butter cups.

Peanut Butter Marshmallow Treats

A fluffernutter is a sandwich made with marshmallow fluff and peanut butter. But it’s so much more than a sandwich! It’s an EXPERIENCE.

As a kid, fluffernutter’s were the quick and easy snack or lunchbox treasure. Big bites of peanut butter, fluff and wonder bread were washed down with an ice cold glass of milk after school.

I might not be a kid any more but I still love peanut butter and marshmallow fluff. They’re the perfect addition to another lifelong favorite of mine: Rice Krispie Treats!

Fluffernutter Rice Krispie Treats are soft, chewy no-bake peanut butter krispie treats with ribbons of gooey marshmallow and topped with mini peanut butter cups. Perfect rice krispies recipe for peanut butter lovers!

Our fluffernutter cookies take that classic peanut butter marshmallow combo and create a chewy treat!

Ingredient Notes

Ingredients needed to make peanut butter krispie treats.
  • Marshmallows – You will need both mini marshmallows AND regular size marshmallows to make these treats.
  • Peanut butter – We used creamy peanut butter, but crunchy peanut butter will work too if you like the texture.
  • Peanut butter morsels – There are melted and spread over the tops of the rice krispie treats.
  • Mini Reese’s peanut butter cups – We pressed them on top of the bars at the end because chocolate makes everything better!

You’ll also need puffed rice cereal (Rice Krispies) and unsalted butter for this Fluffernutter Rice Krispie Treats recipe.

Tips and Tricks

Step by step photos showing how to make peanut butter krispie treats.
  • Line your baking dish! Rice Krispie Treats are STICKY! Place a square of parchment paper on the bottom of your baking dish to prevent sticking. The parchment makes it easier to lift the finished treats from the pan, too!
  • Use the butter wrapper or the plastic marshmallow bag to press the rice cereal mixture into the pan to keep your fingers from getting sticky.
  • Press LIGHTLY. When you add the treat mixture to the pan, use as gentle of a touch as possible. The harder you press, the harder and denser your finished Fluffernutter Rice Krispie Treats will be.
  • Store these bars in an airtight container at room temperature. Enjoy within 5 days for best taste–but I bet you’ll eat them up long before then!
Large cut squares of peanut butter krispie treats with peanut butter cups on top.

Recipe FAQs

How do you melt the peanut butter chips?

I melt the peanut butter chips in the microwave. Use a glass, microwave-safe bowl. Heat in 30 second increments, stirring between each one until the morsels are smooth and melted.

How can I make the melted peanut butter morsels easier to spread?

If the melted morsels are too thick, whisk in a little vegetable oil. Add 1 teaspoon at a time until you reach the desired consistency.

I only have full size marshmallows. Can I still make this recipe?

Yes, you can. Chop your full size marshmallows into small pieces, then fold them into the treat mixture as directed in place of the miniature marshmallows.

Can I freeze rice krispie treats?

I don’t recommend freezing rice krispie treats, personally. I know others do, but I find the texture of the treats changes when they thaw. You’ll enjoy these fluffernutter krispie treats so much better FRESH!

Peanut butter krispie treats on a wooden cutting board.

This delicious krispie treat recipe was inspired by one of my favorite fudge recipes. Fluffernutter Fudge!

Just craving Reese’s peanut butter cups? I’ve got ya covered with these Reese’s Peanut Butter Bars.

More Rice Krispie Treat Recipes

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Fluffernutter Krispie Treats

4.85 from 19 votes
By: Aimee
Peanut Butter Rice Krispie Treats topped with melted Reese’s PB morsels and mini Reese’s PB cups. A delicious twist on a childhood favorite!
Prep Time: 5 minutes
Cook Time: 5 minutes
Additional Time: 1 hour
Total Time: 1 hour 10 minutes
Servings: 16 bars

Ingredients 

  • 10 ounce bag regular sized marshmallows
  • ¼ cup unsalted butter
  • ½ cup creamy peanut butter
  • 5 cups Rice Krispies cereal
  • 1 ¼ cup mini marshmallows
  • 1 bag Reese's peanut butter morsels, melted 10 ounce
  • 2 bags Reese's Mini Peanut Butter Cups 8 ounce each
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Instructions 

  • In a large pot, melt butter over medium heat. Add marshmallows and turn heat to low. Stir until completely smooth. Remove from heat and quickly stir in peanut butter. Add cereal.
  • Fold in the mini marshmallows. Pour Krispies treats into a 9inch square baking dish lined with parchment paper (or buttered foil). DO NOT PRESS them in tightly. Just very gently even the top of the treats (I use the butter wrapper or marshmallow bag wrapper to press it in). Spread melted peanut butter morsels over the top.
  • Top the melted peanut butter morsels with the peanut butter cups. Press those in so they stick! Allow to set, about one hour. Cut into squares and store in an airtight container. ENJOY.

Notes

  • Line your baking dish! Rice Krispie Treats are STICKY! Place a square of parchment paper on the bottom of your baking dish to prevent sticking. The parchment makes it easier to lift the finished treats from the pan, too!
  • Use the butter wrapper or the plastic marshmallow bag to press the rice cereal mixture into the pan to keep your fingers from getting sticky.
  • Press LIGHTLY. When you add the treat mixture to the pan, use as gentle of a touch as possible. The harder you press, the harder and denser your finished Fluffernutter Rice Krispie Treats will be.
  • Store these bars in an airtight container at room temperature. Enjoy within 5 days for best taste–but I bet you'll eat them up long before then!
  • Nutrition

    Calories: 189kcal, Carbohydrates: 28g, Protein: 3g, Fat: 8g, Saturated Fat: 3g, Polyunsaturated Fat: 4g, Cholesterol: 8mg, Sodium: 113mg, Fiber: 1g, Sugar: 14g
    Course: Rice Krispie Treats
    Cuisine: American
    Did you make this recipe?Mention @shugarysweets or tag #shugarysweets!
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    About Aimee

    Aimee is a dessert lover (specifically rice krispie treats), workout enthusiast, self-taught foodie, and recipe creator.

    Learn more about Aimee.

    Affiliate Disclosure:**There may be affiliate links in this post! By clicking on them, or purchasing recommended items I may receive a small compensation. However, I only recommend products I love! Thank you for supporting Shugary Sweets! See my disclosure policy for more info**

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    Posted on February 8, 2023

    Comments & Reviews

    1. 5 stars
      Hi ! I have made these so many times and they are my signature cookie for gatherings. My boy’s friends request them. My advice is to have everything pre-measured out and ready to go because after the marshmallows are melted and peanut butter is stirred in , adding the krispies and little marshmallows go very quickly. Also , if you can have someone hold the pot while you pour it into the pan , it helps, but not necessary. I used to put these in a 13 x 9 pan, but I now put it in the suggested 9×9 and I like it better. Also, I melt one and a half of another bag of peanut butter morsels. They are just so good- thank you for this winner of a recipe!

      PS. I put a sheet of parchment in the pan and use clips to keep it in place when I pour in the krispies mixture. Then it lifts out of the pan easily for cutting on a cutting board.

    2. I’m wondering if anyone has tried to use “NATURAL” peanut butter in this recipe? The kind where the oil “sets” on top of the jar. Thank-you in advance.

    3. Other have asked, please answer the question on pan size. You state a 9 inch square pan. How do you get 32 servings from that small of a pan? What is the size of the bars?

    4. These are awesome but I found I had to add vegetable oil to the melted peanut butter chips because they wouldn’t spread well otherwise. Not sure if any one had this same issue or not?

      1. Hmmm, I occasionally have had trouble melting my PB chips too. The key is to heat them slowly. Glad they turned out good in the end 🙂

    5. Oh, goodness! I missed the “melted” part in the ingredients list and was expecting a step telling me to do that. My bad. I guess I was so excited to make these I read too fast. So sorry! And they were wonderful. A keeper. Thanks!

    6. These are great. However, in the recipe above, I think you left out the step where you melt the Reese’s Morsels and spread the melted morsels over the top of the cereal mixture, before putting the Mini Reese’s Peanut Butter Cups on top. I figured it out, but it would be helpful to have that step included.

        1. I agree. Step #2 says pour treats into pan. Then Step #3 goes directly to ‘Top the melted peanut butter morsels with the peanut butter cups.” It never tells you to pour melted peanut butter chips over crispy treats. I figured it out after looking at the photo, but at first I thought maybe the melted chips were supposed to be added in with the creamy peanut butter in step #1.

    7. I made these and they are delicious. I have one question. Do your mini peanut butter cups melt? Mine started melting as soon as I put them on.

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