Chelsea's Messy Apron

Simple, healthy recipes without sacrificing taste!

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Oatmeal Cookie Pumpkin S’mores Gooey Bars

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Deliciously thick oatmeal chocolate bars with a hint of pumpkin in the middle — thanks to pumpkin pie spice and pumpkin flavored marshmallows. These bars are easy to make and very rich!

Oatmeal Cookie Pumpkin S'mores Gooey Bars

Pumpkin and oats were meant to be together. My favorite Fall cookies are pumpkin oatmeal chocolate-chip and these bars are basically those cookies in a gloriously gooey marshmallow form. Who’s with me on pumpkin oatmeal cookies?!

P.S. Do you like how I specify they are my favorite “Fall cookies”? Because obvi I can’t just have one favorite cookie. As a self-proclaimed cookie connoisseur I have to have a favorite cookie for every season and/or holiday. Like these ones for Christmas…nothing compares.

And there I go talking about Christmas again when I said I was going to wait. I’m such a freak about holidays!! Second P.S. the hubs and I went shopping and found the cutest wood pumpkin decoration. It’s currently sitting on top of our mantel place and making me all sorts of happy and excited for Halloween. The good news is, it’s not only a Halloween pumpkin, so it gets to stay up through Thanksgiving. And along with that shopping trip, we also found little Grey’s Halloween costume. He’s a lobster if you missed the picture of him. Bahaha — he is the cutest lobster ever!!

Oatmeal Cookie Pumpkin S'mores Gooey Bars

What is it and babies in Halloween costumes? I’m totally a crazy person on Pinterest looking at all the baby Halloween costumes all the time. Even before I had a baby. And errr. Even before I was married. Because babies dressed up like fat pumpkins, or popcorn, or LOBSTERS are my favorite kinds of things to look at. And now that I have a baby, the crazy can’t be controlled. So the poor baby has to be in a Halloween costume like every other day because I can’t stop dressing him up in it and then squealing like I’m 15. Please tell me I’m not the only mom that squeals at cute baby clothes particularly lobster Halloween costumes.

And enough about Halloween and adorable costumes because you are here for the food and probably not the crazy that is me around Halloween. Or all the holidays for that matter.

Oatmeal Cookie Pumpkin S'mores Gooey Bars

These bars are SO easy. Only one mixing bowl to make these and then the pan to bake them in. (Which if you line the pan it takes about .5 seconds to wash.) These bars are a must make for pumpkin season. Even though these technically don’t have any pumpkin in them, they are still very much a pumpkin recipe. I used pumpkin spice mallows (my favorite marshmallows EVER!) and then some seasonings in the crust to make them taste all pumpkin-y.

You can definitely increase or decrease the seasonings depending on your love for pumpkin flavors. More cinnamon + pumpkin pie spice if desired and less if not desired. If you omit both the cinnamon and pumpkin pie spice, these taste more like oatmeal s’mores bars, but they still have a slight pumpkin hint from the marshmallows. Also, these are RICH. So be warned. If you want these to be a little less rich, just cut down the chocolate to either 1/2 cup or 3/4 cup. I love the thick chocolate layer, but it definitely makes these over the top rich!

While I get back to Pinterest searching for babies in Halloween costumes, you’d better get to making these. You’re going to love them!!

Oatmeal Cookie Pumpkin S'mores Gooey Bars

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Oatmeal Cookie Pumpkin S'mores Gooey Bars
Prep Time
15 mins
Cook Time
18 mins
Total Time
33 mins
 
Servings: 9 -12 bars
Author: Chelsea
Ingredients
  • 1 and 1/2 cups white flour
  • 1 cup light brown sugar packed
  • 1 teaspoon baking soda
  • 1 teaspoon cinnamon
  • 1 teaspoon pumpkin pie spice
  • 1/8 teaspoon salt
  • 1 and 1/2 teaspoons vanilla extract
  • 3/4 cup butter melted
  • 1 and 1/2 cups old-fashioned oats
  • 1 cup milk chocolate chips
  • ~1 and 1/2 cups Pumpkin Spice Mallows
Instructions
  1. Preheat the oven to 350 degrees F. Line an 8 x 8 baking pan with parchment paper and set aside.
  2. In a large bowl, beat together the flour, brown sugar, baking soda, cinnamon, pumpkin pie spice, salt, vanilla and butter. Beat until well combined and then stir in the oats.
  3. The mixture should be crumbly, but also be able to pack together well. If it is too wet, add a bit more flour, and if it is too dry, add a tablespoon or more of butter.
  4. Separate this crust mixture in two and press 1/2 of the mixture into the prepared baking pan.
  5. Bake for 12-14 minutes and then remove.
  6. Immediately pour over the chocolate chips and spread evenly on top of the crust.
  7. Then press the marshmallows evenly on top of the chocolate chips (there should just be one layer of marshmallows)
  8. Crumble the remaining crust mixture on top and bake for another 5 minutes. Even though the top may still appear a bit gooey, don't bake for longer or the marshmallows will get gross.
  9. Remove from the oven and allow to set up for at least 1 hour (or eat them immediately, but they will be pretty gooey and messy. Which personally I love!)
  10. Cut these bars with a knife that is slightly wet.

 Here are some more pumpkin treats:

Brownie Pumpkin Cookies

No Bake + 4 Ingredients Brownie Pumpkin Cookies

replacepumpkin

Flourless and Healthy Pumpkin Chocolate Chip Cookies 

scones3

Pumpkin Chocolate-Chip Cookie Scones

 Oatmeal Cookie Pumpkin S'mores Gooey Bars

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Comments

  1. Sounds like your son will make the cutest lobster, Chelsea! 🙂 And I agree, pumpkin and oats were meant to be together! I love that you mashed up this dessert and made it into a cookie and gooey bar. These look amazing, Chelsea! Pinned!

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  4. These bars look so fantastic! I am obsessed with s’mores, so I love that you made this incredible-looking fall version! I’m really wanting to make something with those pumpkin marshmallow now. 🙂 Pinned!

    Reply

  10. The bad thing about living in Canada (beside dealing with 6 months of winter), is having a hard time finding certain things… like pumpkin spice marshmallows (!!!!). I’m seriously loving the idea of pumpkin s’mores, though! And no shame in being a little holiday crazy or cute costume obsessed — I’m always squealing when I see cute little clothes in the store… and I don’t even have kids!

    Reply

  12. Love these ooey gooey bars! Those pumpkin spice marshmallows sound amazing in here. Aaw I absolutely love Grey’s costume, he looks so so cute! Haha totally support all the squealing over cute baby clothes and Halloween costumes 🙂

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  15. These bars! So gooey! And all those oats! They look awesome! And I love the lobster costume – one of my old co-workers dressed her baby up as a lobster one year and it was the cutest thing ever!

    Reply

  16. Oh my gosh — we tried to put our little chihuahua in a lobster costume one time… And she just grabbed it in her mouth and swung it around like it was a toy. Whoops! 😉 Love these gooey bars!! I had no idea they made pumpkin marshmallows. Must find. Now. Pinned!

    Reply

  19. These bars look so gooey and irresistible! I have not seen these pumpkin spice mallows – must seek them out right away! Also need to make pumpkin oatmeal cookies b/c I’ve never had them! Babies in halloween costumes are definitely the cutest!! Have you seen the donut costume? I would definitely dress my baby up as a donut if I had one 🙂

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    • You are so sweet! Thank you Diana! You can completely leave it out and these will still be super delicious and decadent (they’ll taste like a regular s’mores bar)! They just won’t have much of a hint of pumpkin and especially if you don’t end up using the pumpkin marshmallows 🙂 Hope that helps!

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    • Regular marshmallows will work they just won’t be very pumpkin flavored. You could add some more pumpkin spice to the base too if desired.

      Reply

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