Oatmeal Cookie S’mores Bars

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Oh for the love of all things gooey: Oatmeal Cookie S’mores Bars are here!

Oatmeal Cookie S'mores Bars - these gooey bars are an easy oatmeal cookie bar recipe filled with gooey marshmallow creme and chocolate!!

Things that are really funny about Jordan:

She cannot, for the life of her, close the car door all the way…but she slams the refrigerator door so hard at 6am on Sunday mornings that it wakes me up.

She will meticulously pick out a super-cool outfit complete with  bright colors and jazzy accessories…but she will go 3 days without brushing her hair.

She cannot remember that she is supposed to clear her dishes after breakfast…but she can recite all the passwords for all the iDevices we own.

She can’t remember something I’ve told her do to 5 minutes after I’ve told her…but she can recite full conversations I’ve had with friends or on the phone or that she’s heard at the gym daycare.

It’s mind boggling.

Oatmeal Cookie S'mores Bars - these gooey bars are an easy oatmeal cookie bar recipe filled with gooey marshmallow creme and chocolate!!

The one thing she can reconcile? That she loves s’mores no matter what vehicle they come in. Parfaits, with cookies, blondies, in pie…she loves s’mores in every form. Who doesn’t?

(My husband doesn’t. He doesn’t like marshmallows. !!!! I love him anyway.)

Easy Oatmeal Cookie S'mores Bars Recipe

We all know that I’m an indoor s’more person. Hand me a blowtorch and a marshmallow on a skewer and I’ll go to town. Make me sit outside and make s’mores? Not going to happen.

So I think I’m making it my goal in life to make alllll things indoor s’more. Frozen pie? Got it. No bake bars? Yup. Blossom Cookies? Check!

And now? We can add Oatmeal Cookie S’mores Bars to the list. I took oatmeal cookie bars and turned them into gooey s’mores bars.

That was a realllly good decision.

Oatmeal Cookie S'mores Bars

I was originally going to make these as peanut butter s’mores bars, but my friend Karen has already done that. But when I was drooling at that gooey goodness I knew it had to happen ASAP…so I decided to turn one of my favorite cookies (oatmeal!) into s’mores bars.

This recipe is super easy, as usual. I decided to adapt my Dulce de Leche Revel Bar recipe into these s’mores bars. The base of the cookie is pretty much the same as my normal oatmeal cookie recipe except it uses a full cup of brown sugar.

Brown sugar is GOOD.

Once you whip up the cookie dough, you press half of it into a 9×9″ pan. Be sure to line it with parchment or foil and spray it well with cooking spray: marshmallows get sticky after they’ve baked!

On top of the bottom cookie dough layer, you spread marshmallow creme. (Also known as “fluff” depending on the brand you buy.) I heated my marshmallow creme in the microwave for just a few seconds to thin it out a little, which makes it easier to spread over the dough. Then you sprinkle chocolate chips all over it and top it with the rest of the cookie dough.

Tip: when you’re spreading the marshmallow, make sure and leave a thin marshmallow-free zone around the edge of the pan. Then, when you drop the rest of the cookie dough on top, make sure it seals around the edges. It’ll keep the marshmallow inside the bars.

Unlike regular marshmallows, marshmallow fluff does not disappear when you bake it. It’s like magic!

Then you cut the bars and they’re super gooey. And s’morelicious. Is that a word? I think I created a word.

Easy Oatmeal Cookie S'mores Bars Recipe! A gooey oatmeal cookie bar filled with marshmallow and chocolate - the perfect indoor s'mores!

These are definitely s’morelicious. And worth every bite!

Check out all my gooey bar recipes!

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Oatmeal Cookie S'mores Bars

These Oatmeal Cookie S'mores Bars are over the top gooey bars! Oatmeal cookie dough is filled with marshmallow cream and loads of chocolate for the most decadent s'more ever!
Servings 16 bars
Author Dorothy Kern


  • 1/2 cup unsalted butter softened
  • 1 cup brown sugar packed
  • 1 egg
  • 1 teaspoon vanilla extract
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 1/4 cups all purpose flour
  • 1 1/2 cups quick cooking oats
  • 1 7 ounce jar marshmallow creme
  • 1 cup chocolate chips milk or semi-sweet


  1. Preheat oven to 350°F. Line a 9x9” square pan with foil and spray well with cooking spray. You can use parchment in place of foil, if you prefer.
  2. Cream butter and sugar in a mixer fitted with the paddle attachment. Cream until smooth, just a minute or so. Beat in egg, vanilla, baking soda, and salt. Mix in flour then slowly mix in oats.
  3. Press half the mixture into the bottom of the prepared pan. It will be a thin layer. The dough is sticky so I suggest spraying your hands with cooking spray to help the dough not stick to you.
  4. Take the lid and foil wrap off the jar of marshmallow creme. Microwave it for just a few seconds (10-20 seconds) watching it carefully - take it out just as it starts growing up out of the jar. Pour over the bottom layer in the pan and spread evenly, being careful to leave a border around the edge with no marshmallow. Sprinkle with chocolate chips.
  5. Use two spoons to scoop the remaining dough. Flatten scoops with your hands and layer over the top of the bars, trying to be sure and cover all the edges with dough.
  6. Bake for about 23-28 minutes, until the top of the bars are golden brown. The pan will still be slightly jiggly. Let them cool completely before attempting to slice. They’ll be gooey! Store in an airtight container for up to 4 days.

Reese’s Peanut Butter Cookie S’mores

Reese's Peanut Butter Cookie S'mores (3 of 7)w

Oatmeal Scotchie Brookies

Oatmeal Scotchie Brookies (6 of 12)

Oatmeal Magic Bars

Oatmeal Cookie Magic Bars (4 of 6)

Sweets from friends:
Peanut Butter S’mores Bars by The Food Charlatan
Soft and Gooey Loaded S’mores Bars by Averie Cooks
S’mores Magic Bars by Wine & Glue


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  1. It’s funny. .  mostly everything you described about Jordan is my 8 year old, Phoebe. This is what I have deciphered because it drives me crazy sometimes. .  is that they will remember and do what they want to. Plain and simple. Kids! God love ’em! 😛 ok, these smores cookie bars. .  ohmygawd ..  I’ll take the ones Mel won’t eat! 

  2. Yep, the way kids “listen” is mind-boggling. Or the way they are perfect listeners in school, but when they come home, nada. Or how they are “starving” all the time, but only for dessert. Love those kiddie contradictions!
    These look stunning. I mean, the PB version woulda rocked, too. But these are pretty dang amazing.

  3. I love that these make a smaller pan- it’s just me and my husband at home now and 9×13’s can be too much- or dangerous to have around! Trying these today! Happy Sunday!

    • That’s totally why so many of my recipes are 9×9. My husband doesn’t eat sweets and neither of us go to a job where we can take them. My daughter and I can easily polish off a recipe!! Enjoy!

  4. I definitely relate to your last point about Jordan; my short term memory is useless but I can still remember the conversation I had with my sister a couple of days ago! These bars are genius, oatmeal cookies plus s’mores is a great mashup, pinned! 

  5. All kids have selective memories, I’m convinced 🙂

    These bars are my heaven. Buttery, with texture from the oats, the fluff, and the chocolate!!

  6. These look addictive and decadent! Pinning!

  7. These look so awesomely delicious. Someday, when it’s less than 85 degrees in my kitchen, I’m definitely making these.

  8. Oh my!  🙂  Too good!

  9. Lol. Jordan. Ya. I find it remarkable how perfect Haley wants her hair and clothing…and yet her room looks like a tornado wiped through it every.single.day. We all love s’mores, too. Any shape and form. Gimme! 

  10. Yeah, my daughter can hear a very quiet conversation between hubby and me two rooms away, yet if I call out to her from a room away, she doesn’t hear me.  Brilliant version of s’mores – I think the oats would prevent an overload of the sweet factor (I must be getting old – a s’mores brownie I shared at a restaurant the other day tasted too sweet to me).

  11. Those oatmeal s’mores bars look super decadent and tasty, Dorothy! And of course, perfect for summertime! Pinned 🙂

  12. I’m an indoor s’more person also. And Oatmeal Chocolate Cookies are my favorite!! Great combo – can’t wait to make them!!
    Thanks so much Dorothy!!!

  13. Smorelicious: totally a word. Also, Charlotte has recently been testing the waters on ignoring her mother. I will be standing 5 feet from her saying “Charlotte. Charlotte. CHARLOTTE.” and she will pretend not to hear me. It’s really funny, until I put her in timeout. 

    These are GORGEOUS my friend!

  14. Jordan makes me laugh! I totally went through the no-hair brushing phase, and I would yell and scream because it would get so tangled! Of course, no one was making me Oatmeal Cookie S’mores Bars at the time. 

  15. Ahhh the no brushing the hair phase, tell her that I went through that… and I ended up with a hair ball that had to be cut out. Not lying. Also can’t believe I just told you that! I do support her love for all things S’mores like these bars!

  16. The fact that these are missing an offending ingredient that won’t be named (AHEM*RAISINS) makes me love you and the bars all the more. 

  17. I’m an indoor S’mores person too and these are right up my street, they look fab and so gooey! 

  18. Sounds like Jordan and I have a lot in common, I have weirdly selective memory, too and a raging s’mores obsession. I will totally be making these bars ASAP!!

  19. Give me all the s’mores bars! No, seriously. ALL of them! 

  20. I could eat s’mores in any form too, I love this oatmeal cookie bar version!  Pinned 🙂

  21. Your daughter sounds like a really fun girl!

  22. Any changes to the recipe if I use whole wheat flour instead?

    • I don’t normally bake with whole wheat flour, but when I do I use a mix of all-purpose and whole wheat, otherwise the structure of the result changes. Try doing half and half, or substitute it all with white whole wheat, which I’ve had good success with!

  23. For the Oatmeal-Cookie-s’mores bars, could you use regular oats in place of quick cook?

    • Yes, the bars will just be a little heartier. However, you can make them quick cook by giving them a pulse in a food processor or blender, then measuring out the amount in the recipe!

  24. So I just made these & it flopped 🙁 It tasted delicious but it turned into a cookie bar for me. The fluff completed disappeared and the chocolate chips melted into 1 layer. I followed the recipe to a T except I made homemade fluff with mini marshmallows and simple syrup (since I had no corn syrup). Im really sad it didnt turn out because I specifically looked up marshmallow recipes because I was in the mood for it. Again the taste was amazing, crispy outside, gooey inside but its not what yours looks like. Ill make them again if you can help trouble shoot for me 🙂

  25. I tried these on a whim and brought them to our Super Bowl party — big success! I love them! Super creative idea for a sweet treat! Thanks for sharing.

  26. Wow! I’ve had a strange craving for s’mores lately and have decided, I’m an indoor s’mores person 🙂 I’m going to try these this weekend! I’ve never tried marshmallow fluff before but it looks even more fun than marshmallows. Just wondering, what brand of the fluff did you use? Is there a difference in fluff or creme?

    Thank you!

  27. Hi,
    I would love to try these?
    Can you freeze these? I’m looking for a different bar recipe that I can freeze ahead of time!

  28. Can you substitute some graham flour for the reg flour to make them “s”more taste like smores? 😉 I´m going to try today!

  29. So I read a few other recipes that said the graham flour would make it too crumbly or mushy – so I just broke them up into small pieces. Worked ok – you get the flavor, but disappointed the marshmallows melt into nothing. Will work on that – maybe a bar will hold up better?!

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