Next Post
Our 45 Most Popular Back-to-School Recipes.
This post may contain affiliate links, please see our privacy policy for details.
Toasted Marshmallow Mashup Cookies. Think soft and chewy chocolate chip cookies, but with a mashup twist—oats for heartiness, salty pretzel bits for crunch, melty dark chocolate, and gooey toasted marshmallows swirled throughout. They’re sweet, salty, buttery, extra gooey, a little toasty, with just the right amount of addicting. Perfect for game day gatherings or those back-to-school bake sales. These are the cookies that will disappear first!
With both school bake sales and football season on the horizon, I figured cookies were a must. Last year I shared my toasted caramel marshmallow rice krispie treats—do you guys remember those? So many of you still make them on repeat, and they’re always a hit.
Now, I’ll be honest—marshmallows are not usually my go-to ingredient. I don’t love them…unless they’re toasted. Toasted marshmallows? Completely different story. Gooey, golden, just the right amount of caramelized. And in my mind, a little goes a long way. These cookies are exactly how I love them—soft, chocolatey, gooey, with that irresistible marshmallow toastiness.
I’m so excited to finally share these with you—they just might become your new fall favorite cookie!
Here are the Cookie Details
Step 1: Gather your ingredients
You’ll need the basics: butter, dark brown sugar, flour, baking powder, baking soda, and sea salt. Simple, simple—nothing fancy, but all good things.
Now for the stir-ins, which are the most important part! Grab old-fashioned oats, salted pretzel twists, pecans, semi-sweet or dark chocolate chips, and of course, marshmallows—the real magic in these cookies.
Step 2: Mix the dough
Start with soft butter and beat it together with the dark brown sugar and vanilla. Add in 2 whole eggs plus 1 extra yolk.
Next, mix in the flour, baking powder, baking soda, and salt. Stir in the oats, crushed pretzels, chopped pecans, and chocolate chips until just combined. These are best eaten warm, right out of the oven, so keep that in mind as you mix!
Step 3: Toast the marshmallows
To do this quickly, I use the broiler. Arrange the marshmallows on a baking sheet and broil until golden and toasty.
My one very important note here—do not walk away from the oven. Every broiler cooks differently, but they all toast FAST. Marshmallows can go from white to black in seconds, so watch closely.
Once toasted, gently fold the marshmallows into the cookie dough. They don’t need to be fully mixed in—just a few swirls of gooey marshmallow are perfect.
Step 4: Bake
Scoop the dough into ¼ cup-sized balls (these are big cookies!). Arrange no more than 6 per baking sheet to give them plenty of space.
Because they’re large, they’ll need a bit more oven time. Bake at 350 for 8 minutes, then rotate the pans and bake for another 4–5 minutes, until just set. Remove from the oven and let the cookies rest on the baking sheet to finish cooking.
They’ll be gooey, golden, and looking so delicious. Enjoy one warm—or package them up for your next bake sale or game day. Guaranteed crowd-pleasers!
Some notes
These cookies will spread—so be careful not to overcrowd the baking sheet! The result is slightly crisp edges with perfectly gooey centers (just like the photos).
For a slightly thicker cookie, skip the extra egg yolk and stick with only 2 eggs. They won’t spread as much but will still be soft and delicious.
Sticky marshmallows giving you trouble? Dampen your hands with water and wipe them dry—this trick makes handling the dough so much easier.
Looking for easy party desserts? Here are a few ideas:
Chewy Chocolate Peanut Butter Bars
Chocolate Peanut Butter Pretzel Blondies
Homemade Vegan Peanut Butter Twix Bars
Caramel Butter Cake with Fudgy Chocolate Frosting
Retro-Style Chocolate Sheet Cake
Toasted Marshmallow Caramel Rice Krispie Treats
Lastly, if you make these Toasted Marshmallow Mashup Cookies, be sure to leave a comment and/or give this recipe a rating! Above all, I love to hear from you guys and always do my best to respond to each and every comment. And, of course, if you make this recipe, don’t forget to tag me on Instagram! Looking through the photos of recipes you all have made is my favorite!
Mashup Cookies
Servings: 22 cookies
Calories Per Serving: 238 kcal
Nutritional information is only an estimate. The accuracy of the nutritional information for any recipe on this site is not guaranteed.
Ingredients
- 2 sticks (1 cup) salted butter, at room temperature
- 1 cup dark brown sugar
- 2 large eggs, plus 1 egg yolk, at room temperature
- 1 tablespoon vanilla extract
- 2 cups all-purpose flour
- 2 teaspoons baking soda
- 2 teaspoons baking powder
- 1/2 teaspoon sea salt
- 2 cups old fashioned oats
- 1 1/2 cups mini pretzel sticks, crushed
- 1 cup pecans, chopped
- 1 1/2 cups dark chocolate chips
- 1-2 cups regular marshmallows, to your taste
Instructions
- 1. Line a baking sheet with parchment paper. Preheat the broiler. 2. In a large mixing bowl, beat together the butter, brown sugar, and vanilla until combined. Beat in the eggs and 1 egg yolk, one at a time, until combined. Add the flour, baking soda, baking powder, and salt. Beat in the oats, pretzels, pecans, and chocolate chips. 3. Arrange the marshmallows on a baking sheet. Broil 1-2 minutes, until toasted. Watch closely, the marshmallows will toast FAST. Remove and turn the oven to 350°F. Mix the toasted marshmallows into the cookie dough, just a few stirs, do not over-mix it. 4. Roll the dough into 1/4 cup sized balls. Place 3 inches apart on the prepared baking sheet. You can add a few toasted marshmallows on top or extra chocolate chips!5. Bake at 350°F for 8 minutes, then rotate the pan and bake another 4-5 minutes. Some of the cookies may spread more than others. Remove from the oven and let the cookies cool on the baking sheet. They will continue to cook slightly as they sit on the baking sheet. 6. Eat warm (highly recommended) or let cool and store in an airtight container for up to 4 days.
This post was originally published on August 19, 2025
confused…directions say use granulated sugar also, but ingredient list doesn’t mention it or how much…help…all my ingredients are out on the counter!
Hi Dee! I am so sorry for the confusion! There’s no granulated sugar in this recipe, I’ve fixed the written recipe! 🙂 xT
Method says to beat in brown and granulated sugars, but no granulated sugar is listed in the ingredient list.
Hi Patty! I am so sorry for the confusion! There’s no granulated sugar in this recipe, I’ve fixed the written recipe! 🙂 xT
How much granulated sugar do you use? It’s in the description but not in the ingredient section.
Hey Adelle! So sorry for the confusion, this recipe actually doesn’t call for granulated sugar! Hope you enjoy these cookies! xT
First, I adore all your recipes and I’m in the midst of baking these cookies. Two things I’m wondering, the instructions say add granulated sugar, but nothing in the ingredients list. I just used brown sugar. Now time to bake, these is no temperature indicated for baking? I’m going with 375F?
I’d appreciate clarifications.
Thanks,
Carroll
Hi Carroll! I am SO sorry for the confusion! The recipe has been updated to clear up both of these things! xT
These cookies are so good!! I used mini marshmallows because that’s what I had on hand. I kept the marshmallows separated on the pan the best I could, then I pulled them apart after I broiled them and threw them in the batter. What a yummy recipe, I’ll definitely be baking these again!
Hi Patty! Thanks so much for trying out the recipe! So glad you loved these fun and gooey cookies! 🙂 xT
Also I don’t see a temperature for baking?
Hi Leslie! So sorry about that, bake at 350! 🙂 So sorry for the confusion! xT
What temp do you bake the cookies on? Also, in your recipe it says add granulated sugar but I don’t think the recipe calls for that? Can’t wait to make!
Hi Ally! So sorry for the confusion! You bake the cookies at 350 🙂 Enjoy! xT
Hey! Are we cooking the cookies on Broil? I did not see a temperature listed?:)
Hey Addison! I am so sorry for the confusion here. That cookies should be baked at 350 degrees F. Do not broil them.
I apologize for the trouble!! Recipe is corrected now. I hope you just love these cookies! xT
Now they’re just called “Mashup Cookies”… are they Toasted Marshmallow Mashup Cookies, Gameday Mashup Cookies, or Mashup Cookies?
Hi Tina! These are titled toasted marshmallow mashup cookies, they definitely would be perfect for game day though! 🙂 xT
These were soooo messy to make & the marshmallows didn’t mix in at all. It was so hard to get them remotely incorporated into the dough, and the finished product was not great at all.
Hi Glenda! I’m so sorry this didn’t turn out as expected. Marshmallows can be tricky in dough since they melt or stick differently depending on temperature and mixing. I appreciate your feedback and will keep it in mind, sometimes chopping them smaller or folding them in gently can help with incorporation. Thanks for giving the recipe a try! xT
How are you supposed to cut marshmallows after broiling them? Any tips?
Hi Glenda! Once your marshmallows are toasted under the broiler, place them on a baking sheet and let them cool slightly so they firm up a bit. Then, use a sharp knife warmed under hot water (wipe it dry between cuts) to divide them cleanly. This helps the marshmallow cut smoothly rather than sticking! Hope you enjoy! xT
Is my question still in the approval queue? I’ve asked twice now, this is frustrating.
Hi Glenda! I replied to your question, let me know if you have any other questions! 🙂 xT
I noticed you cracked the pretzels with a metal mallet on your counter. Does your counter get scratched from it? I want to try it (less clean up!) but I don’t want to mess up my countertops…
Hi Mary! I totally get that concern, yes, I do crack the pretzels with a metal mallet on my counter, but I would recommend using a cutting board or a towel underneath to protect the surface. That way it’s easy, less clean-up, and your counters stay scratch-free. Definitely give it a try! xT
Interesting, thanks for the explanation!! I’m just curious why you don’t do it that way then. 🙂 truly just asking & would love a response back!
These did not turn out well at all, I’m really disappointed.
Hey Kelly! I am so sorry you didn’t enjoy this recipe! Please let me know if there’s anything I can do to help improve the recipe! xT
Are these called Toasted Marshmallow Mashup Cookies or Game Day Mashup Cookies? The post title is different from the recipe title
Hi there! These are the marshmallow mashup cookies! Hope you love them! 🙂 xT
The recipe yields 22 cookies. You say to put no more than 6 cookies on a baking sheet because they will spread. That means you would need 4 baking sheets or you would have to wait for the baking sheet to cool before reusing. Most ovens have space for 2 baking sheets. This recipe isn’t very efficient or convenient.
Hi! I understand, it can feel a bit inconvenient with just two oven racks. You can bake two sheets at a time and rotate them halfway, or line your sheets with parchment so you don’t have to wait for them to cool as long! Smaller cookies can also help prevent spreading and make the process easier. Hope this helps! xT
What do you mean by “rotate them halfway”?
Switch the top ones to the bottom rack and the bottom ones to the top rack so they get an even bake! 🙂 xT
Can these be frozen??
Hey Valerie! Yes! You can freeze these cookies either as dough or baked. For dough, scoop and freeze on a sheet, then transfer to a bag, bake from frozen, adding a few extra minutes. For baked cookies, cool completely, store in an airtight container or bag, and thaw or warm before enjoying! 🙂 xT
Can these be made into bar cookies? How would I need to alter the recipe?
Hi Nancy! I haven’t ever tried these in bar form before, but that should work great! Let me know if you give them a try! 🙂 xT
You said “These are best eaten warm” but cookies don’t stay warm at bake sales…do they still taste ok if they’re cold? Also, what are back to school bake sales?
Hi Renee! Yes, the cookies will absolutely be delicious even if they’re not eaten warm! Hope you enjoy! 🙂 xT