Ooey, gooey soft rice krispie treats are loaded with creamy peanut butter and sweet marshmallow fluff for the perfect fluffernutter flavor! All you need are 5 ingredients and 30 minutes. Next time try my fluffernutter cookies or thick and chewy fluffernutter bars.
Here’s the thing about these fluffernutter rice krispie treats: there is nothing healthy about them and they’re everything I wanted them to be. They’re soft, and ooey, and gooey, and taste like I covered a fluffernutter sandwich with cereal.
Okay, that doesn’t sound appealing or particularly delicious, but you’ll just have to trust me. These are delicious.
In today’s edition of “Why Can’t Leslie Just Leave Things Alone”, I needed to level up the classic rice krispie treats. The base recipe that you find on the side of the Rice Krispies box makes a perfect decent treat, but it’s just not enough for me. They need to be softer and butterier.
So, I solved those problems by adding more marshmallows and more butter. But I still wanted more flavor. I was just… bored.
You all love fluffernutter recipes!
Recently I’ve been digging into my site analytics to see what my audience (that’s you!) has been loving lately, and the fluffernutter cookies and fluffernutter bars are consistently near – or at – the top of the list.
So, I figured… if you love those fluffernutter recipes, maybe you’d love another one. And rice krispie treats are already chock full of marshmallows, so all I’d need to do is add peanut butter!
Not so fast, Leslie.
Marshmallow fluff makes these bars super soft
Marshmallows and marshmallow fluff don’t have the same flavor, so just adding peanut butter was underwhelming. What it really needed was the addition of both peanut butter and fluff. On top of the marshmallows.
And you know what? Let’s add some more mini marshmallows for fun.
That resulted in the softest and most flavorful rice krispie treats I’ve ever made. And it’s strong with the fluffernutter flavor I wanted.
How to make the best rice krispie treats
Place parchment paper in the baking pan and spray with nonstick spray. This ensures they won’t stick! Make sure there’s a bit of overhang over the sides to make it easy to lift the bars out of the pan, too.
Use fresh marshmallows! I can’t emphasize this enough. If you try to use a bag of mini marshmallows that have been hanging out in the back of your pantry since last Christmas and have the texture of little doorstops, they’re not going to melt and it just plain won’t work. New, squishy and soft marshmallows are essential!
And use fresh cereal, for that matter. Don’t use stale cereal either, because you will notice.
Don’t press them into the pan too tightly. You want to gently spread them out to evenly distribute them in the pan, but you’re not trying to pack them down. The tighter the pack, the denser they’ll be, which means less light and chewy. And we want light and chewy! You can spray your hands with a little nonstick spray and use your palms to gently press it down, or place another piece of parchment paper on top before using your hands to press it down.
Set aside some mini marshmallows to add at the end. Adding those extra marshmallows that haven’t melted yet add a little extra fluff and chewiness to the final product. The intact mini marshmallows are a nice little surprise when you encounter them. That’s why I save a cup or two of marshmallows to add right at the end.
Tips for slicing rice krispie treat bars
I’m going to share a little secret with you: when I pull these out of the pan, I slice off the edges to get the corners squared so no one gets a weird, sloped, lopsided piece.
And then I eat those cut off pieces. I consider it payment for my time. Plus, you know, taste testing.
Not a secret, but a helpful tip: slicing bars like these are infinitely easier when I use a rocking pizza cutter (affiliate link) versus a large knife. It’s big enough to span the width and the length of the bars, so you get one long, even cut.
Plus, it’s easier on your cutting boards because you just rock the blade from side to side, instead of digging in and dragging a knife. Win-win.
Can I make these in a 9″x13″ pan?
You sure can! Just double the recipe – they’ll have a different thickness than they would in a square pan, but it won’t affect the flavor.
How to clean saucepan after making rice krispie treats
If you’re using a non nonstick pan (definitely should have phrased that differently), you may have to put in a little extra effort to clean it.
Scrape out as much excess sticky rice krispie leftovers as you can with your spatula, then fill it with hot water and place it back on the stovetop. Bring it to a boil and let it sit for a bit. The residue will melt off the sides and bottom and float to the top!
Then you can skim that out of the water and throw it in the trash, then clean the pan with dish soap and water per usual.
Are they really sticky and messy?
Surprisingly, they’re not overly sticky and impossible to eat! That was a sacrifice I was going to be willing to make for the flavor I wanted.
You will, however, still want to store any leftovers in an airtight container between layers of parchment paper just to keep them from sticking together.
But you know, for the purposes of food photography, stacking them without parchment paper is a-okay.
Do as I say, not as I do.
How to store rice krispie treats
You can store them at room temperature between layers of parchment paper in an airtight container for 2 days.
You can also store them in the freezer for up to 1 month – again, in an airtight, freezer-safe container between layers of parchment paper.
To defrost, just let them sit on the counter at room temperature for about 30 minutes before serving. Due to the marshmallow fluff, it tends to take a little bit longer than your typical Rice Krispie Treats.
If you want more peanut butter…
- Fluffernutter Cookies
- Fluffernutter Bars
- Easy Peanut Butter Oreo Fudge
- Chocolate Peanut Butter No Bake Cookies
- Chocolate Chunk Peanut Butter Cookies
- Peanut Butter Espresso Cookies
- No Bake Cookie Overnight Oats
- Buckeye Balls
- Peanut Butter Banana Bread with Salted Chocolate Chips by Hunger Thirst Play
- Nutter Butter Waffles by Whitney Bond
- No Bake Peanut Butter Pie by Spicy Southern Kitchen
After you’ve made this recipe, please consider coming back to share your experience with others by leaving a comment below with a star rating!
Fluffernutter Rice Krispie Treats
- ✓ Read the recipe from beginning to end
- 6 cups Rice Krispies cereal
- 6 tablespoons unsalted butter
- 6 cups mini marshmallows, divided
- 1 cup creamy peanut butter
- Pinch of salt, if your peanut butter doesn’t have any
- 7.5 ounce container of Marshmallow Fluff
- Prep a 9×13 baking pan with parchment paper so that the edges hang over the sides of the pan, and then spray with nonstick spray. Set aside.
- Pour Rice Krispies into a large bowl and set aside.6 cups Rice Krispies cereal
- In a medium saucepan, melt butter over low heat. Add 4 cups mini marshmallows and heat, stirring frequently, until melted and mostly combined – it’s okay that it’s not fully incorporated, it’s better that way!6 tablespoons unsalted butter | 6 cups mini marshmallows
- Turn off heat, add peanut butter and stir to combine. If the peanut butter you’re using doesn’t have added salt, you can add a pinch of salt at this point and stir to combine.1 cup creamy peanut butter | Pinch of salt
- Immediately pour peanut butter mixture into the bowl of Rice Krispies, add Fluff and remaining 2 cups mini marshmallows and stir to coat and combine.7.5 ounce container of Marshmallow Fluff
- Turn out into prepared baking dish and press down into an even layer.Tip: If you have another 9×13 pan, you can use the bottom of that pan to press into the top of your dish for an easy way to get it evenly distributed! You can also spray your hands with a little nonstick spray and use your palms to press it down, or place another piece of parchment paper on top before using your hands to press it down.
- Let set for at least 15 minutes, and then slice into 12 large bars. Serve and enjoy!
- ✓ Check oven calibration
- ✓ Check expiration dates
- ✓ Properly measure ingredients
- ✓ Check butter temperature