Fluffernutter Blondies

Marshmallow Peanut Butter Chip Blondies

I read this really fascinating article the other day about why time seems to speed up as we get older. It’s actually a wonderfully simple explanation of this common phenomenon, and it turns out that we’re not all going crazy.

Time does speed up as we age. See, when we’re little, a month seems like forever because our lives have been pretty short. A six year-old will spend what seems like decades waiting for her birthday because, relatively speaking, a year is a huge percentage of her life. That’s not at all true for a thirty-six year old, for whom a year is a much smaller percentage of life. And by the time anyone reaches much older age, time whizzes by because the majority of years spent alive vs. any time increment is much larger.

Do I sound like a total nerd here? You caught me. I am a nerd about a lot of things, like Shakespeare,Β Star Trek,Β and getting older. Getting older scares me, and the faster time goes, the more my existential dread rears its ugly head. But since I’m also a baking nerd, I can use my prowess in the kitchen to provide some much-needed distraction from time’s unyielding march onward.

Marshmallow Peanut Butter Chip Blondies

This might be the second peanut butter recipe I’ve posted this week, and do I care? Nope. I have a healthy, gluten-free carrot muffin arriving Friday to atone for my peanut butter sins. But for now, you’ll have to live with my addiction to all things peanut butter. This recipe actually came out of a sick day my son spent with me.

Kids get mysterious viruses, especially in the summer. For the past couple of days, my son has been home, languishing on the couch like a Victorian-era heroine. He has his blanket, his books, his pencils and pens, and a bottle of cool water by his side. He’s pretty much been ignoring them all, not to mention avoiding all food and television. When they don’t ask for TV, I know they’re sick.

Marshmallow Peanut Butter Chip Blondies

To try and tempt him (and to gauge how sick he really was), I baked these bars. They’re a basic blondie filled with peanut butter chips and topped with a marshmallow fluff and peanut butter topping. If a kid avoids these sticky squares of goodness, you have further evidence that not all is right in his little world.

To top it all off, my son has been avoiding Alexa. A few weeks ago on Amazon Prime Day (which was, for me, kind of disappointing), Kenny bought us an Amazon Echo. She’s named Alexa, and she syncs up to our devices and apps (like Pandora or, of course, our Prime accounts) to play us music or update our shopping lists or buy something we’ve bought before. I’m officially scared of her. Especially after seeing the latest Terminator movie. #riseofthemachines #machineswillkillusall

Marshmallow Peanut Butter Chip Blondies

The kids love Alexa. All three have been bugging her nonstop. She can’t respond to my girls because their little voices are too squeaky, but she understands my son. So he badgers her to tell him jokes, play him music, and asks her questions. They’re best buds. And he’s been ignoring Alexa for two days. Yep, sick.

The upshot of my baking experiment is that nobody has really eaten these bars except me. My daughters are currently pretending to hate peanut butter (a shaft to their mother’s heart), the boy is sick, and my husband eats only gluten-free whatnot. So here I am, contemplating my existence while I polish off yet another chewy, pillowy-soft marshmallow peanut butter chip blondie.

Marshmallow Peanut Butter Chip Blondies

These bars were an experiment for a good cause, the whole see-if-he’s-really-that-sick thing. Turns out, he is. But I’m not, and I’m going to enjoy these as time passes faster and faster. In the face of scientific evidence that time actually does speed up as we age, what else is a girl to do?


Fluffernutter Blondies


1/2 cup unsalted butter, melted and cooled
1 cup firmly packed brown sugar
1 egg
2 teaspoons vanilla
1/4 teaspoon salt
1 cup flour
1/2 cup peanut butter chips
Marshmallow Topping
2/3 cup marshmallow fluff
1/2 cup peanut butter
7 oz. (1/2 of a can) sweetened condensed milk (I used fat free)
1/2 cup peanut butter chips (for garnish)


  1. Preheat the oven to 350. Line an 8-inch square pan with foil, leaving enough to hang over the sides. Coat with cooking spray and set aside.
  2. In a bowl, combine the melted butter with the brown sugar. Stir until smooth. Add the egg and vanilla and stir again. Mix in the salt and flour until everything is incorporated. Fold in the peanut butter chips.
  3. Pour the batter into the prepared pan evenly. Bake for 15 minutes. Remove from the oven.
  4. While the blondies are baking, make the topping. In a small bowl, combine the marshmallow fluff, peanut butter, and condensed milk until smooth.
  5. Carefully layer the mixture over the blondies and spread out evenly. Sprinkle the peanut butter chips on top.
  6. Return the bars to the oven for 20-25 minutes until the middle no longer jiggles and the topping is golden on the edges.



I fulfill many roles in life: wife, mother, teacher, everlasting learner. This site is dedicated to one role that expresses my creativity in ways that I find consistently challenging and rewarding: baker. Inventing new ways to enhance food, especially if that food involves chocolate or peanut butter (or both!), is a passion of mine. I look forward to sharing my ideas with you.

This Post Has 28 Comments

  1. Medha @ Whisk & Shout

    Your bar recipes are always killer! Love this marshmallow/pb combo- haven’t seen just those two paired together and I love it πŸ™‚
    Medha @ Whisk & Shout recently posted…Weekly Obsessions!My Profile

    1. Mir

      Thanks, Medha! I’m a devoted bargirl!

  2. Gayle @ Pumpkin 'N Spice

    That’s actually a very good explanation for why time does speed up. Never thought of it like that before! These blondies look fantastic, Mir! I love the peanut butter and marshmallow combo. These look like little squares of perfection!
    Gayle @ Pumpkin ‘N Spice recently posted…One Pan Pizza BakeMy Profile

    1. Mir

      I liked that explanation too, Gayle. Now at least I don’t think I’m nuts. πŸ™‚

  3. Dannii @ Hungry Healthy Happy

    I read an article like that a couple of years ago too, but it didn’t make me any less scared of getting older haha.
    These look epic – you can’t go wrong with a peanut butter and marshmallow combo.
    Dannii @ Hungry Healthy Happy recently posted…Comment on Healthier Summer Berry Slice by DanniiMy Profile

    1. Mir

      Exactly, Dannii. Still terrified!

  4. Alice @ Hip Foodie Mom

    Mir, I hope your son feels better soon!!! sick kids are the worst! I feel so bad for them when they are sick. . and yes, from one mother to another, I can completely appreciate the experiment to see-if-he’s-really-that-sick .. and these bars?! I love peanut butter so I would be there helping you to polish these off. . peanut butter chips and that marshmallow topping?! love! and your daughters pretending to hate peanut butter is like my daughters, the only kids in the universe, who don’t like and won’t eat mac and cheese! Seriously, I don’t get it!
    Alice @ Hip Foodie Mom recently posted…Back to School with PackIt Freezable Bags + A Giveaway!My Profile

    1. Mir

      Whenever kids go on a strike against kid food I get weirded out. Like, what kid won’t eat pizza? Or PB? Or chicken nuggets? Yep, mine. I’m a failure, Alice!

  5. Cheyanne @ No Spoon Necessary

    My inner Nerd self is LOVING your nerd 411 on aging and time! Makes complete sense to me, thank you for shedding some light on that subject for me! Another thing I am loving is your peanut butter recipe rampage! So.Good! Keep ’em coming girlfriend! These blondies just sound incredible! Peanut butter and marshmallow is SOOOO yummy together, but in blondie form??? OMG- Hand them over! ALLLL of them! Love Love LOVE! Pinned!
    Side note- I hope your son feels better soon! And I have never heard of an Amazon Echo- totally googling that now. πŸ™‚ Cheers, girlie!
    Cheyanne @ No Spoon Necessary recently posted…No Churn Blueberry Cinnamon Graham Cracker Swirl Ice CreamMy Profile

    1. Mir

      Thanks, Cheyanne! Even though I just learned about your cocoa allergy, I am doing okay over here. πŸ™‚ And I’m glad my nerd self doesn’t weird out out. The geeks shall inherit the earth!

  6. Sam @ SugarSpunRun

    Um, wow I’m so glad you just explained to me why the older I get the faster time flies, that makes perfect sense!!!

    Sorry to hear your son is sick! If he wasn’t able to absolutely devour these (let alone eat even one) he must be feeling terrible! Hope he’s feeling better soon!
    Sam @ SugarSpunRun recently posted…Island CookiesMy Profile

    1. Mir

      Thanks, Sam! Happy to be your nerd for the day! πŸ™‚

  7. Manali @ CookWithManali

    I don’t mind your PB recipes Mir, keep them coming! it can never be enough! love these blondies!
    Manali @ CookWithManali recently posted…Corn Spinach Stuffed Mini PeppersMy Profile

    1. Mir

      You’re a girl after my own heart, Manali!

  8. Michele @ Two Raspberries

    oh my gosh! I love the name of these so cute! πŸ˜‰ they look SO good too ! I love blondies and with PB YUM!
    Michele @ Two Raspberries recently posted…Yam Potato Mash – Vegan – Gluten FreeMy Profile

    1. Mir

      Thanks, Michele! I do like cute names.

  9. Erin @ Miss Scrambled Egg

    Mir – I’m drooling over here. πŸ™‚ These look so good. I might just need to make them this weekend. I have a few friends who would go totally crazy over the marshmallow and peanut butter combination. <3

    1. Mir

      Oooh, let me know if you do, Erin!

  10. Jocelyn (Grandbaby cakes)

    Come to mama! I want these in my belly now!
    Jocelyn (Grandbaby cakes) recently posted…S’mores Iced CoffeeMy Profile

    1. Mir

      They’re in mine and life is good, Jocelyn!

  11. Rachelle @ Beer Girl Cooks

    I’m loving your nerdy explanation of time passing. That sounds like an interesting article. I’m also loving your fluffernutter blondie business. These blondies sound like an awesome flavor bomb! Sorry that your little dude is feeling under the weather. I hope he’s feeling better soon!
    Rachelle @ Beer Girl Cooks recently posted…Grilled Peaches and WatermelonMy Profile

    1. Mir

      He’s much better, thanks! Now I’m down for the count. Life of a mom!

  12. Mary Frances

    That actually makes so much sense. And I can relate to that phenomenon … should I be comforted that it will only get worse as I get older??
    Um there is no such thing as a peanut butter sin. Heck, someone could have a peanut butter only blog and I’d be happy. These blondies are the stuff of weekends and coffee dates and all the wonderful things. I’d like some for breakfast, please and thank you!
    Mary Frances recently posted…Mini Blueberry Coconut CupcakesMy Profile

    1. Mir

      If you find it comforting, then great! I personally just find it frightening. I wish I had a PB only blog!

  13. Danielle

    Time definitely does seem to speed up the older we get, but it definitely makes sense as to why now! I don’t know why I never thought to make fluffernutter blondies, but these are incredible!
    Danielle recently posted…Skinny Double Chocolate MuffinsMy Profile

    1. Mir

      Thanks, Danielle! It does make sense. Doesn’t make me happier, but it’s interesting anyway!

  14. Dorothy @ Crazy for Crust

    You could post ALL PB recipes and I’d be happy! And that’s fascinating about how time feels. I never thought about it that way!
    Dorothy @ Crazy for Crust recently posted…Zucchini Cream Cheese MuffinsMy Profile

    1. Mir

      Me, neither. But I’m a nerd, Dorothy! And time DOES speed up. I’m not a fan!

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