These brown butter marshmallow crispy cookies are a crispy cookie loaded with rice krispies and chewy mini marshmallows with a caramel tasting brown butter dough. They are simple to make, no chilling required and taste better than Costco's (yep! I said it)!
I got so excited when I had multiple requests to remake this marshmallow crispy cookie from Costco because I love all things that taste like a rice krispie treat! These cookies have such a fun crunch from the rice krispies and the perfect chew from the marshmallow. My whole family fell in love with these while I was testing them and I'm sure you will love them too!
For more cookie recipes, try my: triple chocolate cookies or my biscoff cookie butter cookies.
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Why You Will Love This Recipe
- Better than Costco: This cookie is VERY similar to the Costco version, but fresh always tastes best!
- Rice Krispie Treat flavor: These taste like a rice krispie treat in cookie form.
- Browned Butter: I believe that brown butter can elevate a cookie so much.
Ingredient Notes
Full ingredient measurements and instructions can be found in the recipe card below.
- Butter: You will brown the butter and use it as soon as it has cooled.
- Sugars: You will use both brown and granulated sugar for these cookies.
- Rice Krispies: This gives these cookies the perfect crunch.
- Marshmallows: You will use mini marshmallows for these.
- Flaked Salt: This is my only deviation from the Costco version, but If you know me at all.. flaked salt on top is a must for cookies.
Step by Step Instructions
- Step 1: Start by browning the butter. You'll take ½ cup of butter and melt in a medium saucepan, and then continue to cook past the point of boiling. You will do this over medium heat, past the point of the butter foaming, until it turns a nice golden brown, and has a nutty smell. Make sure you are stirring and watching it, because it will turn from perfectly brown to burnt fairly quickly. Once finished browning, pour into a bowl and throw in the fridge or freezer for about 10 minutes to cool.
- Step 2: In a medium mixing bowl mix together brown butter and both sugars. Add the egg and vanilla and mix on low until smooth, about 30 seconds.
- Step 3: Slowly mix in the salt, baking soda and flour being careful not to over mix.
- Step 4: Fold in the rice krispies, followed by the mini marshmallows.
- Step 5: Scoop the dough into large balls, I like to use a 3 tablespoon cookie scoop for these. Place 4-5 cookies per cookie sheet as they spread thin and you'll need space.
- Step 6: Bake the cookies for 10-13 minutes. You're looking for a light golden brown around the edges. Be careful not to over bake, or you will lose the chewy center. Sprinkle with flaked salt.
Expert Baking Tips
- The marshmallows will spread out as they cook, if that makes your cookies become slightly misshapen you can use a spatula or spoon and push the edges back in to create a perfect circle.
- These are a thin, buttery cookie. If you prefer to have a slightly thicker cookie I would add 2-3 tablespoons extra flour.
- Make sure when browning your butter that you keep an eye on it. It will go from golden brown to over cooked fairly quickly.
- I have given both cups and grams as measurements. Grams will be more precise, especially when measuring flour. If you don't have a kitchen scale, no problem! Just lightly spoon flour into your measuring cup to insure its not packed in there. Light and fluffy is the key.
FAQ
No, if you prefer you can just use 7 tablespoons of melted butter. You will use 1 tablespoon less to account for the moisture lost while browning the butter.
Yes, just make sure that you sub in a gluten free 1:1 ratio flour and use a gluten free rice krispie.
Yes, you can skip the marshmallows, or even add chocolate chips if you prefer. I also have a rice krispie cookie recipe that doesn't have marshmallows if you wanted to try that.
Storing & Freezing
These marshmallow crispy cookies will remain fresh if stored in an airtight container at room temperature for 2-3 days. You can also prep the cookie dough in advance and store it in the fridge for about a week.
You can freeze your cookies in an airtight container for 2-3 months with them remaining fresh. You can also freeze the cookie dough balls if you would like to bake them one at a time. If baking the cookies from frozen I would bake them at 325 instead of 350.
Other Popular Recipes to Try
For more yummy treats follow me on instagram @thesaltedsweets. And be sure to tag me and comment if you make them and love them as much as I do!
Marshmallow Crispy Cookies (Costco Copycat)
Ingredients
- ½ cup (113.5 g) salted butter
- ¾ cup (165 g) brown sugar
- ½ cup (100 g) granulated sugar
- 1 large egg room temperature
- 1 teaspoon vanilla this is a good time to use vanilla paste if you have it
- ½ teaspoon (0.5 teaspoon) baking soda
- ¾ teaspoon (0.75 teaspoon) salt
- 1 cup (158 g) + 2 tablespoon all-purpose flour
- 1½ cups (43 g) rice krispie cereal
- ⅔ cup (30 g) mini marshmallows
- flaked salt for topping
Instructions
- Preheat oven to 350 F. Line a baking sheet with parchment paper.
- Start by browning the butter. You'll take ½ cup of butter and melt in a medium saucepan, and then continue to cook past the point of boiling. You will do this over medium heat, past the point of the butter foaming, until it turns a nice golden brown, and has a nutty smell. Make sure you are stirring and watching it, because it will turn from perfectly brown to burnt fairly quickly. Once finished browning, pour into a bowl and throw in the fridge or freezer for about 10 minutes to cool.
- In a medium mixing bowl mix together brown butter and both sugars. Add the egg and vanilla and mix on low until smooth, about 30 seconds.
- Slowly mix in the salt, baking soda and flour being careful not to over mix.
- Fold in the rice krispies, followed by the mini marshmallows.
- Scoop the dough into large balls, I like to use a 3 tablespoon cookie scoop for these. Place 4-5 cookies per cookie sheet as they spread thin and you'll need space.
- Bake the cookies for 10-13 minutes. You're looking for a light golden brown around the edges. Be careful not to over bake, or you will lose the chewy center. Sprinkle with flaked salt.
Sandy
I have not tried the Costco version, but these cookies are so delicious! I love the crunch that the rice krispes add and the chew from the mini marshmallows. Browned butter just elevates anything so all in all, so tasty!
Bailey
These are to die for!! So good!!
Andrea Philipsek
These cookies are so tasty, I just love them. My cookies got real thin and flat, I chilled the brown butter in the fridge for 15 min and weighed the flour. Do you think I’d have better luck if I chilled the dough for an hour or so before baking?
Stephanie Colwell
Add 2 more TBSP of flour and chill dough before baking 🙂
Jules
These were so good!! Way better than the Costco cookies.
Page M
I pretty much only make your baking recipes at this point. I live to share them with my neighbor friends and when I made these this week one of them said “I’m convinced every cookie you make is the best cookie I’ve ever had”. I told her it’s because I only make your cookies! The Rice Krispies cookie was a fan favorite for my kids and neighbors and everyone immediately needed your recipe and asked when I’m making more! So crispy but so chewy. The perfect combo! Will be a top repeat! Thank you!
Chris Miller
These are amazing! Doubled the recipe and my hubs’ fantasy football draft guys devoured them that evening. Good thing I’d sampled one earlier and saved out some for our neighbors across the street. The browned butter gives them a great flavor. Highly recommend making these. Do note that mine weren’t the prettiest cookies, but the flavor more than made up for that. (I just cut the caramelized spread edges off…and devoured them myself before placing the two dozen cookies on a cake stand for that evening. I got 29 cookies from the doubled recipe)
Erica
Like a cookie and rice crispy treat in one
Jaimi H
So delicious but mine were very flat??? Help!!!
Brooke Homec
They are a thin (flat) buttery cookie since I was making them like the Costco ones. But you can always add a tad more flour (2-3 tbsp) if you feel like the dough was too sticky, or you want a little more puff to them.
Jaimi Harrison
They are soooo good! I’ll add a tad more flour! Love them ❤️❤️❤️
Erin
The flavor profile for these is AMAZING oh my god. But these cookies spread out so much and I feel like the 3 tbsp cookie scoop was too big. I think I will try again after chilling the dough overnight. I appreciate you making this recipe, the Costco cookies were phenomenal.
Alicia D.
Hey Erin! I agree the three tablespoon cookie scoop did make the cookies a bit too big for my taste and they spread a bit too much. I’m going to also chill my dough and see if that helps make the cookie chewier for the next batch. Let me know if this worked for you!
Jenni
These are our new favorite cookies. I made them for a party and every single person went on and on about how good they were! I loved the texture!!
Lisa
I have not had the Costco version, but this cookie is delicious!
Brooke Homec
Thank you!!
Lisa Mendez
Found out about these viral cookies and was happy to see this recipe. These cookies are so tasty, I love the texture, chewy and crispy!
Janee
Wow! This is incredible! I didn’t even try the Costco cookie but no need to, this is in my top 10!
Sarah
I haven’t tried the Costco ones to compare, but these were absolutely delicious! I made them smaller (got about 24 cookies) and baked them for 9 minutes. I’ll be making them again! And easy too.
Brooke Homec
Thank you so much!
Ashley
These are AAAAmazing! I have 3 boys and all three like different types of cookies, but these were a huge hit among all three and my husband. I won't say what my husband said, but bottom line, he thinks they are some of the best cookies he's ever had. Their favorite cookie is a Twix cookie from a different cookie guru, but my husband thinks your marshmallow crispy cookies even tops those! Easy to make. No chill time and fool proof. I cooked mine slightly longer than the recipe said because the centers were still gooey, but once done, they were perfect! Thanks for sharing the recipe!
Kathy
Are these freezable
Brooke Homec
yes!
Makenna
Do you freeze them before or after baking?
Brooke Homec
either way works!
Jen M
Finally tried the Costco ones and knew I wanted a homemade version. These were delicious and very chewy. My family enjoyed them!
Alicia D.
These were great! Like other commenters my cookies spread a bit too much at 350 degrees for 11 minutes. I put the remaining dough in the fridge for a while to see if that helps for the next batch. I think chilling dough in the fridge usually helps that problem 🙂.
Brooke Homec
Thanks Alicia! Yes, these are a very thin cookie, so chill the dough and they won't bake up as thin.☺️
Clare
This recipe just won us the Golden Spatula award, which is a hard-earned cooking baking contest among our friends. These cookies are amazing, thanks for sharing!
Brooke Homec
yay!! That makes me so happy. Congrats!
Laura
I’m not sure what I did wrong (I bake a decent amount and followed the recipe to a t) but these came out super inconsistent - some cookies spread out thin while others did not. That said, the flavor is delightful so I can’t be too mad!
Brooke Homec
The marshmallows will make the cookies spread where they are, so that may have been why some did more than others. You can always take a little spatula or knife and push it in where it spread too much.
Terri
I made these on a whim because I was craving the ones I got from Costco weeks ago. These are such a great copycat. I browned butter to the first time with this recipe. It was easy to follow, prep and bake. I will absolutely be using this recipe again.
Ana Dubin
My husband is allergic to dairy. I know they won’t be nearly as good, but have you ever tested making these with margarine or vegan butter?
Brooke Homec
I haven't tried, but I think it would work great!
Anne Marie Ashley
So delicious!!! Chilled the dough one hour. Fantastic!!!
Brooke Homec
Yay!! Thank you so much Anne!
Kari Lyons
So delicious! It was my first time browning butter for a cookie recipe, so I appreciated your very clear instructions on how to do so. I did five cookies per baking sheet, baked for 10 minutes, then rotated 180 for the last three minutes. Every single cookie turned out perfectly! My family's consensus is these cookies are better than Costco's 🙂
turf
I make a lot of cookies and these are among my most requested. One thing I have found is the type of marshmallow matters. Regular ones melt too much. So you use vegan ones like Trader Joes', or Dandies (sold at Walmart). These retain their integrity and don't melt into nothing.
Shellyn
These cookies were so good and it’s how I found this site. My cookies did come out thin and I added a little extra flour so not sure what I need to do to get them a little thicker… either way they were delicious!