Easy Fluffernutter Rice Krispie Bars

If you grew up dunking peanut butter sandwiches into jars of marshmallow fluff while pretending it was a health food, congratulations — you’re exactly who I made these for. This is an amped-up childhood classic: gooey marshmallow, salty peanut butter, and crisp Rice Krispies all smooshed together into bars you can eat with your hands and absolutely no shame. It’s nostalgic, ridiculous, and solves the world’s snack emergencies at 3 p.m. and 10 p.m. (also solves hunger while doing a poor job of fixing emotional turmoil — that’s on you).
Family fail: My husband tried to help once and grabbed the “microwave-safe” bowl that was, in fact, ceramic and not microwave-safe. It survived, mostly. The marshmallow, not so much. Our toddler declared the resulting flakiness “modern art” and smeared it on the dog. I pretended to be annoyed, but secretly I was very proud of our collective creative mess. Yes, this pan is too small. No, I won’t wash fewer dishes. I will, however, eat more bars.
Why You’ll Love This Easy Fluffernutter Rice Krispie Bars
– They taste like every childhood sleepover and none of the awkward group hugs.
– Peanut butter + marshmallow = instant crowd pleaser. Bring these to a party and watch adults regress to their 8-year-old snack selves.
– Quick to make, faster to disappear. If you blink, someone has already stolen one.
– No fancy equipment. Your mixing skills can be gloriously mediocre and still succeed.
Time-Saving Hacks
– Use a silicone spatula and microwave the fluff/peanut butter mix in short bursts. Yes, it’s technically lazy, but also fast and delicious.
– Spray your pan with nonstick spray or line it with parchment paper and call it “cheating with elegance.” Saves a spatula and your dignity.
– Measure cereal by eyeballing. Cereal is forgiving. Your kitchen scale is not required.
– Melt in one bowl, mix in the same bowl — fewer dishes, more time to snack. Don’t tell anyone I said that.
– If you’re in a rush, skip the pressing step and just pat it down with wax paper. It will look rustic and intentional.
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Serving Ideas
– Serve with a cold glass of milk like it’s 1998 and you haven’t discovered almond milk yet.
– For adults: pair with coffee, or wine if the kids screamed loud enough to require something stronger.
– Cut into bite-sized pieces and put on a fancy plate to impress someone who doesn’t know how easy this is.
– Serve in a Tupperware and pass it off as “leftovers” to test who in your family cooks more often.
– Honestly, keep it simple: hand-to-mouth method works best.
What to Serve It With
Pair with salty snacks (pretzel sticks, potato chips) for that sweet-salty mashup. Fresh fruit balances the sugar if you pretend you care about nutrition. If you’re hosting, lay out napkins like you’re classy, then proceed to let everyone eat with their hands.
Tips & Mistakes
– Don’t overheat the marshmallow; scorch it and you’ll be scraping toasted sugar off the bowl and feeling feelings.
– Press the mixture into the pan while it’s warm — it sticks better and you won’t have crumbs everywhere. Use wax paper to press if you love your fingers.
– If the bars are crumbly, you either didn’t use enough marshmallow/peanut butter glue or you were too stingy with pressure. Be bolder.
– If your pan is too small (it always is), portion into two or just accept the overflow as a “crispy edge bonus.”
Storage Tips
Store it in the fridge… if there’s any left. Cold midnight leftovers? Sometimes better than fresh. Keep in an airtight container at room temp for 2–3 days, or refrigerate up to a week if you want them firmer. Freezing works too—wrap individual bars in plastic, then foil, and they’ll cheerfully thaw into your life when you need a sugar hit.
Variations and Substitutions
Swap whatever you want—sugar ↔ honey, soy sauce ↔ tamari, or skip steps and call it “deconstructed.” It still counts. Try almond butter for a nutty twist, mini chocolate chips for drama, or toasted coconut for texture. Use gluten-free crisp rice if needed. More peanut butter = more heroism.
Frequently Asked Questions

Easy Fluffernutter Rice Krispie Bars
Ingredients
Main Ingredients
- 0.5 cup unsalted butter melted
- 1 cup peanut butter
- 4 cups mini marshmallows
- 6 cups Rice Krispies cereal
- 0.5 cup chocolate chips for topping
Instructions
Preparation Steps
- In a large saucepan, melt the butter and peanut butter over low heat until smooth.
- Add the mini marshmallows and stir until completely melted.
- Remove from heat and stir in the Rice Krispies until evenly coated.
- Press the mixture into a greased 9x13 inch pan and smooth the top.
- Sprinkle chocolate chips on top and allow to cool before cutting into bars.
Notes
Featured Comments
“This rich recipe was will make again — the crowd-pleaser really stands out. Thanks!”
“Made this last night and it was will make again. Loved how the crowd-pleaser came together.”
“New favorite here — will make again. crowd-pleaser was spot on.”
“Super easy and turned out amazing! My family asked for seconds. Saving this one.”
“Made this last night and it was turned out amazing. Loved how the sweet treat came together.”
“Made this last night and it was will make again. Loved how the sweet treat came together.”
“Super easy and turned out amazing! My family asked for seconds. Saving this one.”
“This rich recipe was will make again — the crowd-pleaser really stands out. Thanks!”
“Super easy and absolutely loved! My family asked for seconds. Saving this one.”
“Made this last night and it was family favorite. Loved how the creamy came together.”