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These Crumbl No-bake marshmallow peanut butter cornflake cookies are easy, low-effort, no-bake sweet treats that you can make for those weeknight sweet cravings or for big holidays like Christmas, Thanksgiving, and Easter!
If you enjoy no bake desserts and sweet treats you have to try these Crumbl Chocolate Crunch Cookies | Star Crunch Copycat and these no bake 3-ingredient peanut butter cookies as well as this delicious No Bake Chocolate Pie with Oreo Crust, and Peanut Butter Rice Krispy Treats with Marshmallows. They all hit the spot and require no baking at all making them perfect for weeknight baking.
I’m obsessed with Cornflakes, so indirectly, I’m obsessed with these no-bake peanut butter cornflake cookies. They have just the perfect amount of crunch without being too hard.
They also have a slight saltiness to them which makes them extremely addictive if we’re completely honest. I pretty much have handfuls of this cereal whenever it’s at the house because to me it tastes like a combination of crackers and cereal with hints of saltiness for my salt-addicted self.
This is the best no bake peanut butter cornflake cookie recipe ever!
Today, I decided to recreate a holiday crowd favorite, AKA the no-bake peanut butter cornflake candies or cookies. They are very similar to rice crispy treats with peanut butter but instead of using regular puffed rice, we will be using Cornflakes.
The secret ingredient to keep them extra chewy is the addition of the mini marshmallow at the end. It will help make these no-bake cookies a whole experience! Trust me!
Table of Contents
- This is the best no bake peanut butter cornflake cookie recipe ever!
- Why you need to make this recipe!
- Ingredients for this peanut butter cornflake cookies recipe
- How to make Crumbl cornflakes marshmallow cookies from scratch?
- Frequently asked questions – FAQ
- Crumbl No bake marshmallow peanut butter cornflake cookies
- No bake peanut butter Cornflake cookies with marshmallows Recipe
- Shop this recipe
- If you enjoyed this Crumbl cornflakes marshmallow cookie recipe make sure to pin it for later!
Why you need to make this recipe!
- It requires no baking.
- Can be made with only a handful of ingredients.
- Looks so impressive yet is so simple to make.
- Great for entretaining crowds and celebrating birthdays or holidays.
- Can be made any time you crave your favorite Crumbl cookie recipe without spending a ton of money or having to wait for it to comeback in stores.
Ingredients for this peanut butter cornflake cookies recipe
Here are the ingredients you will need to make this no-bake cornflake Krispy treat cookie. Make sure to scroll down to the recipe card for the full detailed ingredient measurements.
- Butter– Use salted butter for this recipe.
- Peanut butter– Smooth peanut butter will work great. Make sure to use regular peanut butter and not the natural,healthier version as it wouldn’t allow these to set.
- Marshmallows– Mini marshmallows are best for these Cornflakes krispy treats.
- Peanut butter chips– These will be melted and drizzled on top of our no bake cookies for a gorgeous finish.
- Oil- The oil is used to thin out the peanut butter chips for drizzling.
- Cornflakes cereal– These are the star of this recipe and the things that will take the crunch factor to the next level. Make sure to use regular cornflakes cereal and not the frosted cornflakes.
How to make Crumbl cornflakes marshmallow cookies from scratch?
This is how you can make these Crumbl cornflakes marshmallow cookies. Make sure to scroll down to the recipe card for the full detailed instructions!
- Melt the butter and peanut butter together in a large pot.
- Add in the mini marshmallow and mix.
- Fold in the cornflakes cereal.
- Mix in the mini marshmallows just until combined.
- Scoop out 10 equally sized cookie dough balls, place them on a parchment lined baking sheet.
- Using your fingers, gently spread the cookies to form a cookie shaped cirle.
- Let set for 20-30 minutes before drizling with the peanut butter and oil mixture.
- Enjoy!
Why are my no bake cornflakes marshmallow cookies not gooey?
This can depend on a few things.
If you overcook the peanut butter marshmallow mixture it will almost caramelize and harden as it cools down, so make sure to melt it low and slow.
The next issue could be that it’s just too cold where you’re at. The solution to this would be to pop them in the microwave for 5 seconds and enjoy them.
Frequently asked questions – FAQ
How long will my no bake cookies stay fresh for?
These cornflakes cookies will last for up to 2 days in an air-tight container at room temperature.
I strongly suggest popping them in the microwave for 5 seconds before enjoying them. They will become ooey-gooey again and so so good!
How long does it take for these peanut butter Cornflake cookies to set?
Depending on the temperature of your kitchen these can take anywhere from 20-35 minutes to set. You pretty much need to allow them to get back to room temperature from being hot right out of the pot.
Can I refrigerate these no bake cornflakes cookies?
It’s preferable to keep these cookies at room temperature to keep them soft. Once they go into the fridge, they will become too hard to enjoy.
Can I freeze my Crumbl peanut butter Cornflakes marshmallow cookies?
No, these cookies don’t freeze too well. They are best had the same day you. Freezing them will mess up the texture of these no-bake cookies, unfortunately.
Crumbl No bake marshmallow peanut butter cornflake cookies
If you made these no bake Crumbl cornflake marshmallow cookies and enjoyed them, don’t forget to leave a 5-star review by clicking on the 5 stars under the title and description. It would help me a ton
No bake peanut butter Cornflake cookies with marshmallows
Ingredients
- 4 tbsp butter salted
- 3/4 cup peanut butter smooth
- 10 oz mini marshmallows
- 1/3 cup peanut butter chips optional
- 7 cups cornflakes
- 1 oz mini marshmallows To mix in at the end
- 2 tbsp peanut butter chips for drizzling
- 1/2 tsp vegetable or canola oil
Instructions
- In a large pot over medium-low heat melt the butter, and the peanut butter. Add in the 10 oz of the mini marshmallows, stirring constantly until fully melted. Remove from heat.
- Stir in the cornflakes until fully coated. Mix in the rest of the mini marshmallows (1oz) and the optional peanut butter chips and gently fold to combine. Don't overmix.
- Spray a large cookie scooper with nonstick cooking spray and scoop out 10 equally sized peanut butter cornflakes balls onto a parchment-lined baking sheet. Grease your fingers and gently spread the cookies to about 1 inch in thickness. Don't pack them so they aren't too dense.
- Melt the peanut butter chips and oil in the microwave in 30-second increments mixing in between every time. Pour the mixture n a ziplock bag and cut a small opening in the top of the bag and top each cookie with some peanut butter drizzle.
- Let set for 20-30 minutes before serving.
Notes
Why are my no-bake cornflakes marshmallow cookies not gooey?
This can depend on a few things. If you overcook the peanut butter marshmallow mixture it will almost caramelize and harden as it cools down, so make sure to melt it low and slow. The next issue could be that it’s just too cold where you’re at. The solution to this would be to pop them in the microwave for 5 seconds and enjoy them.How long will my no bake cookies stay fresh for?
These cornflakes cookies will last for up to 2 days in an air-tight container at room temperature.
I strongly suggest popping them in the microwave for 5 seconds before enjoying them. They will become ooey-gooey again and so so good!
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Thank you for making it all the way down here 🙂
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If you enjoyed this Crumbl cornflakes marshmallow cookie recipe make sure to pin it for later!
I’m going to order gluten free Corn Flakes on line since it is not available where I am. My two cousins and I are going on a road trip several hours away. We will be leaving very early in the morning (like, 5 or 6- – and I am not a morning person 😩), so I was wondering if I could make these the day before? Also, do you have other recipes using Corn Flakes, since the box they come in is pretty big and I don’t eat Corn Flakes normally. Thank you.
Why? Why isn’t the recipe at the top of the page? Nobody comes here for meandering stories about how good somethign is. They come here for the recipe.
Please put the recipe at the top, and put a “Jump to meandering story you didn’t come here for” button a the top. That way I can read your story while enjoying your recipe, instead of suffering in hanger while looking for what I came here for.
Oh, I feel the hanger in this comment! 😆 There’s a “Jump to Recipe” button right at the top, so you can skip straight to the good stuff. But here’s the thing: The extra details help people get the best results (because no one likes a failed recipe)
I subbed the cornflakes for Original Special K. These were so delicious! Literally a fluffernutter rice cripsy treat. I could eat these all day.
I’m so glad you enjoyed the treats with the Special K substitution. You’re one smart cookie!
I added Reese’s pieces and chocolate chips. This is my new favorite no bake recipe. Thank you for sharing it with us!
You’re welcome Ann!
Made a batch at for a bake sale. Kind of crumbly so I think I needed more marshmallows or pb to help bind it together better. But they tasted amazing. I used Honey Bunches of Oats with Almonds.
Thank you for making the recipe!
Thanks so much for this recipe! I had some Trader Joe’s Cookie Butter on hand that wasn’t getting used very often, so for the 3/4 cup of peanut butter in the recipe I used half peanut butter and half cookie butter. Turned out delicious!
Genius!
I tried the recipe, it’s really good.
I followed the recipe, except I used cookie butter spread. It didn’t seem that there was nearly enough melted butter/spread/marshmallows to coat all of the cornflakes and make them sticky. I doubled the amount of melted ingredients and tried mixing it with the original batch and the cornflakes still did not stick together. Is the ratio of 3/4 cup butter spread and 10 0z of marshmallows to the 7 cups of corn flakes correct? What am I doing wrong?
I bake quite a bit, but Im clearly not very good at this simple no bake dessert.
I can see where it might feel tricky! Cookie butter spread is softer than peanut butter, so it doesn’t firm up the same way when mixed with butter and marshmallows. That’s probably why your flakes didn’t stick together as well. Peanut butter adds structure while cookie butter stays looser. If you want to use cookie butter, I’d suggest reducing the cornflakes slightly (start with 6 cups instead of 7) and letting the mixture sit for a couple of minutes after stirring so it thickens before scooping. You could also add another small handful of mini marshmallows to help bind everything together. Don’t worry though, you’re not doing anything wrong, it’s just the ingredient swap changing the texture.
If I could leave a picture I would because these came out just like the picture. Super easy and quick to make. Peanut butter lovers perfect snack or meal. Whatever you desire lol. A nice twice on rice krispy treats
I love this comment Mike! Thank you so much!
Delicious! Tastes just like the Crumbl cookie!
Thank you Noelle.
Maybe it’s the type of pb I used, but it didn’t quite taste like Crumbls version. Either way it’s not bad to snack on
For the PB I used SKIPPY Creamy Peanut Butter! If you make these again maybe with this PB maybe you’ll like it better 🙂
So easy and tasty. I somehow got 17 cookies! I could eat the whole pan, they’re that good!