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Boooo! Halloween Monster Mash Cookies! Festive, easy, sweet, and gravely spooky! Homemade chocolate chip cookies, made with oats, pretzels pieces, plenty of chocolate chunks, spooky Halloween M&M’s, and crazy candy eyes. There’s nothing not to love about these sweet chocolate cookies with a little salty pretzel crunch. Each bite is slightly crisp on the edges but soft and gooey in the center with melted chocolate throughout.
Ahhh! I am so happy to share these! In all honesty, I’ve wanted to make these fun, super yummy cookies for months. Actually, since almost a year ago when I made my much loved Christmas Monster Cookies. It was then that I knew that Halloween Monster Cookies needed to follow.
I’m not sure which cookie I love more. Both are unique, special, and melt-in-your-mouth delicious.
I know, I’m such a dork, but nonetheless, I just love how fun Halloween can be!
I wanted to share them very early in the Halloween season. My hope is that you can bake them up for all of your Halloween needs. Parties, school functions, and even just as a fun cookie to bake on a random weekday. Whatever you bake them up for, they require almost no effort!
Spooky details
Start off by gathering all of your ingredients. You’ll need the basics: salted butter, dark and light brown sugar, flour, baking powder, baking soda, and salt – the usuals.
You’ll also need the stir-ins, they’re the most important element of these cookies. You’ll need old-fashioned oats, salted pretzel twists, semi-sweet or dark chocolate chunks, and candy eyes. Plus plenty of spooky Halloween M&M’s, which, of course, make these cookies.
Simply mix up the dough, bake each cookie off, and then enjoy!
We love to eat these cookies warm, just out of the oven. They’re just the right type of gooey delicious cookies to pull out, slightly cool, and indulge in.
One thing that’s important to note, is that these cookies do spread, so don’t stress on that. Because of this, they’re meant to have slightly crisp edges and perfectly soft gooey centers, just like in the photos. My favorite type of cookie. Everyone has really been loving these cookies, they’re definitely an Oslo favorite!
If you want a bit of a thicker cookie, simply omit the additional egg yolk and use only two eggs. As a result, this will give you a thicker cookie without as much spreading.
To get the M&M’s to really pop, I like to add in a few just before the cookies finish baking completely. This way each cookie has a bit of the festive M&M’s right on top.
Excited to see you all bake these up this month! What’s incredible about these cookies is just how easy they are. So have fun with them and enjoy every shamefully sinful spooky monster bite!
Looking for other Halloween cookies? Here are my favorites:
“I put a Spell on You” Poison Apple Martini
Black Widow Peanut Butter Bars
Hocus Pocus Spellbook Brownies
BOO! Chocolate Peanut Butter Bars
Milk Chocolate Stuffed Jack-O’-Lantern Cookies
Lastly, if you make these Halloween Monster Mash 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 do make this recipe, don’t forget to tag me on Instagram! Looking through the photos of recipes you all have made is my favorite!
Halloween Monster Mash Cookies
Servings: 20 cookies
Calories Per Serving: 311 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
- 1/3 cup light brown sugar (or more dark brown)
- 2 large eggs, plus 1 egg yolk
- 1 tablespoon vanilla extract
- 2 cups all-purpose flour
- 2 teaspoons baking soda
- 2 teaspoons baking powder
- 1/2 teaspoon kosher salt
- 2 cups old fashioned oats
- 1 1/4 cups Halloween M&M’s
- 1 cup mini pretzel sticks, crushed
- 1 cup semi-sweet chocolate chips or chunks
- candy eyes
Instructions
- 1. Preheat the oven to 350° F. Line a baking sheet with parchment paper.2. In a bowl, beat together the butter, brown sugar, and vanilla until combined. Beat in the eggs and 1 egg yolk, 1 at a time, until combined. Add the flour, baking soda, baking powder, and salt. Beat in the oats.3. Fold in 1 cup of the M&M's, the pretzels, and chocolate chips. 4. Roll the dough into 1/4 cup size balls. Place 3 inches apart on the prepared baking sheet.5. Bake for 8 minutes, then rotate the pan and bake another 2 minutes. Pull the pan out and push the remaining M&M's and candy eyes into the cookies. Bake 2-3 minutes. 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 or let cool and store in an airtight container for up to 4 days.
These look so fun! Curious where you found the eyes with the eye-lashes on them? They add so much character! Thanks!
I just saw where you answered this in a previous comment – Amazon, but sold out. I’ll keep looking!
Sorry about that!!
Thanks so much Abby!! Here is the link for the eyes, they are currently sold out!
https://shopstyle.it/l/bMsrL
Let me know if you give the recipe a try, I hope you love it! xT
These turned out absolutely perfect! I flattened the balls of dough ever so slightly, and tapped the sheet on counter as suggested. Used Reese’s Pieces instead of M&M’s. Hands down, best cookies ever!
Hey Ashley,
Amazing!! I am so glad to hear that these cookies turned out well for you, thanks so much for giving them a try! Happy Sunday! 👻
These are all-time favorites for us! We like to add peanut butter chips instead of all or half of the choc chunks sometimes, which is also delicious. I also add a little cinnamon which goes great with the oats. I always make them with whole eggs just for convenience and I think the texture is fantastic. Putting M&M’s on top is a game changer! Making again tonight with the new Halloween colors <3 Thanks for a recipe I’ll make a million times!
Hey Sadie,
Happy Sunday!!🎃 I truly appreciate you making this recipe and sharing your feedback, I am so glad to hear it was enjoyed!
I really loved these! I put my own spin on them by using walnuts in place of the pretzels but they were fantastic. Not overly sweet and perfectly soft and gooey. Question – I didn’t get around to baking all the dough last night and have the rest in an airtight container in the fridge – is that ok and how soon should I ensure I make them (how long could you store unbaked in the fridge or freezer)? Thank you!
Hey Austin,
Thanks so much for trying these cookies, such a great idea to use walnuts!! Totally, you could keep the dough in the fridge for 3-4 days or pop in the freezer for up to 3 months, just be sure to bring the dough back to room temp before using again! xT
Very tasty cookie! I did notice they my cookies were thicker and didn’t spread (even though I followed the recipe and added the third yoke). I’m wondering if perhaps I crushed the pretzels too fine. I also put the dough in the fridge because I had a 45 minute gap between when I finished the dough and when I could bake them, and I rolled them into balls and did not flatten. Is there anything different you would recommend I do?
Hey Tricia,
Thanks so much for giving these a try! Next time, don’t put the dough in the fridge, cold dough has a hard time spreading! I hope this helps! xT
Thank you so much for the tip! They were very yummy regardless, but I’ll definitely make that edit for next time. 🙂
Made them and they came out perfect! Can they be made without the oats? My kids would’ve preferred them without it. What can you sub it with or an you just omit?
Hey Eva,
Happy Friday!👻 Thanks a bunch for giving this recipe a try and sharing your review! I love to hear that it was enjoyed! Ive not tested this recipe without the oats, but I would try adding 1/3 cup of flour. I hope this helps! xT
Can’t wait to try make these for our Halloween party this weekend! Do you think they will turn out as flat if I use 1:1 gluten free flour?
You bet, that should work well for you! I hope you love the recipe! xx
These are super cute and turned out well but I agree with the other comment that there was something off for us too. Maybe too much salt, with salted butter pretzels and kosher salt. I will definitely try again maybe omitting the pretzels. Thanks for all the amazing recipes!
Hey Lee Ann,
Thanks so much for making these and sharing your feedback! So glad to hear they were enjoyed! Let me know how they turn out without the pretzels! xx
These are so cute! Mine also did not spread, as others mentioned below. But they are pretty and puffy and festive…and they taste great!
Hey Kim,
Thanks so much for making these cookies! So sorry to hear they didn’t spread for you! Next time, try gently pressing the dough down with your hand and tapping the baking sheet on the counter during the baking process. I hope this helps! 👻
Made per directions with grandkids. They turned out yummy and fun. They did not go flat, but that was fine. The kids loved the eyeballs.
Hi Connie,
Happy Sunday!!🎃 I truly appreciate you making this recipe and sharing your feedback, I am so glad to hear it was enjoyed! xTieghan
My 4 year old and I made these today! I wanted to love them but something was off. Not sure if it was too many oats or the addition of pretzels. I think we’ll try them without pretzels next time! Ours also didn’t get quite as flat as yours so maybe flattening them a little bit before baking would help?
Hi Nicole,
Thanks for trying these cookies, sorry to hear you had some issues! What kind of oats did you use? You could certainly skip the pretzels next time. I would gently press the dough balls down with your hand before baking and then tap the baking sheet on the counter several times while the cookies are baking to get them flatter. I hope this helps! xT
Thanks for the tips. I used old fashioned oats!
Followed exact recipe and they came out super thick. I was hoping they would be nice and flat like the ones you made. Not sure where I went wrong
Hi Nick,
Thanks for giving the recipe a try, sorry they turned out thick for you! Next time, you could try gently flattening the dough with your hand before baking and then tapping the baking sheet on the counter while baking. I hope this helps! xT
Made these this afternoon for the kids’ after school snack. They proclaimed this way the best snack I’ve ever brought them for the car ride home. Win! And so fun for us Halloween-loving peeps!
Hey Amy,
Happy Wednesday!👻 I love to hear that this recipe was enjoyed and appreciate you giving it a try and sharing your feedback! xx
Super cute, but mine came ou thicker than yours – went through recipe and did everything the same so idk why – and I thought they were kinda dry. Fam likes my usual better.
Hey Kelly,
Thanks so much for trying these cookies! For a thinner cookie, try removing the baking sheet during the baking process and tapping the sheet pan on the counter. I hope this helps! xTieghan
Made these last night and used 1 tsp each of baking soda and powder because of the comments. They turned out great and were a huge hit with the kids!! (Also bonus afternoon activity getting them to sort M&Ms into the colours we wanted 😉 )
Hey there,
Perfect!! Thanks so much for giving these cookies a try, I love to hear that it was enjoyed! xTieghan
These are so cute! Cannot wait to make them, but was wondering where you found the candy eyes with eye lashes? Or did you draw on traditional candy eyes?
Thanks so much Katie!! I found those on Amazon, but they are currently sold out! Please let me know if you have any other questions, I hope you love the recipe! xT
I baked these last night – so impressed how cute they are!! Easy recipe, mostly on-hand ingredients ( had to buy the Halloween M & Ms plus the eye candies ) and those are two things I like about recipes. Great Job!!
Hey Bethany,
Amazing!! I love to hear that this recipe was a hit, thanks so much for trying it out! xT🍂