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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.
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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
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.
Nutrition
Nutritional information is only an estimate. The accuracy of the nutritional information for any recipe on this site is not guaranteed.
Did you make this recipe? Please rate & comment below.
Another delicious recipe from HBH! I made these for a Halloween party and got so many compliments!
Hey Reilly,
Wonderful! I’m so glad to hear this recipe turned out well for you, thanks for making it. Have a great week!
Where do you find Halloween m&ms? I’m wanting to make these with my Foods class, but cannot use Reese’s pieces due to allergies. Thanks!
Hey Cailyn,
I would check your local Target or Walmart, those are usually my go tos! Let me know if you make these cookies!
I made these cookies for a Halloween Witch Party. They were a big hit. Could not find Halloween M&M’s so I used Reeces Pieces. I will be making again. Thank your for your recipes.
Hey Stephanie,
Thank you so much for giving this recipe a try and sharing your thoughts, I’m so happy it worked for you! Have the best week!
This looks so fun for my nephew’s halloween birthday party, but I can’t find the eyes with eyelashes. Could youl et me know where you found them. Thank you!
Thanks so much, Deborah! So sorry, I no longer have link for those, I found them on Amazon years ago. I would check Target, Amazon, or even Hobby Lobby. I hope you love these cookies and happy birthday to your nephew!
Thank you! I’ll keep searching for them . They are just too cute.
I had fun baking these cookies with my 5 year old granddaughter today! I left out the extra egg yolk. Cookies were, festive, chewy and absolutely delicious! I can’t wait to try Christmas Monster Mash recipe!
Hey Lisa,
Thank you so much for giving this recipe a try and sharing your thoughts, so happy it worked for you! Have the best Sunday!
Where did you find the eye candy w/eyelashes?
Hi there,
So sorry, I no longer have a link for the candy eyes, I found them years ago. I would try checking Amazon for something similar. I hope you love these cookies!
Where do you get the candy eyes?
Hi Amy,
I found them on Amazon a few years ago. Please let me know if I can help in any other way!
haven’t made them yet just want to read reviews
I hope you love these cookies, Sam!
Mine didn’t spread much but that’s probably my fault. I cooked like 20 on a baking dish. Flavor was excellent. Wondered if you could use a cup of coconut flakes and a cup of oats instead of 2 cups of oats?
Making again tonight!!
Hi Sarah,
Thanks so much for making this recipe! So sorry, I haven’t tested the recipe with those measurements. Let me know how they turn out!