Let’s talk about Halloween Monster Cookies—because honestly, who wouldn’t love a cookie packed with oats, peanut butter, chocolate chips, and colorful candy? These are a longtime favorite in our house, especially around the holidays. As a mom, I love how easily they come together and how well they feed a crowd—whether it’s a classroom party, a Halloween get-together, or just an after-school treat for hungry kids. They're chewy, hearty, and bursting with fun. Plus, when you grab some Halloween-colored M&Ms, they instantly become festive enough for any spooky celebration. If you’ve been looking for an easy dessert recipe that’s both nostalgic and kid-approved, this one’s for you. Give them a try and let me know what you think—I have a feeling they’ll be a new favorite at your house too!
These cookies are always a hit! Try them soon! Need another Halloween cookie idea?? Try these Halloween Funfetti Cookies!
Ingredients
- eggs
- brown sugar
- granulated sugar
- salt
- vanilla
- peanut butter
- butter
- baking soda
- M&Ms
- chocolate chips
- toffee bits
- mini chocolate chips
- oatmeal
See exact quantities in recipe card below.
Instructions
To begin, preheat your oven to 350℉ and line your cookie sheets with parchment paper for easy cleanup. In a very large mixing bowl, combine the eggs and sugars, mixing well until smooth. Next, add in the salt, vanilla, peanut butter, and softened butter, and mix again until fully incorporated. Then, stir in the chocolate candies, chocolate chips, Heath bits and mini chips if using, along with the baking soda and oats, mixing until everything is evenly combined. Using a tablespoon, drop the cookie dough onto the prepared baking sheets, spacing them about 2 inches apart. Bake the cookies for 8 to 10 minutes, being careful not to overbake so they stay soft and chewy. Finally, let the cookies rest on the baking sheet for about 3 minutes before transferring them to a wire rack to cool completely.
Equipment
A well stocked kitchen puts the joy into baking! If you are looking for a new stand mixer, I love mine! Here is my affiliate link to most of my favorite kitchen tools. Including the best baking pans!
Storage
These keep great in an airtight container for 4-5 days! They also freeze really well for 3-4 weeks!
Top Tip
I like to press an extra candy or two on top of each cookie to just give it a little something extra!
Cookie Ideas
- Chewiest Thinnest Oatmeal Cookies!
- THIN Toffee Chocolate Chip Cookies
- Halloween Funfetti Cookies
- Reese's Thins Peanut Butter Cookies
- M&M Chocolate Chip Cookie Bars
Fall Recipes
Try one of these soon!
Halloween Monster Cookies
Ingredients
- 3 eggs
- 1 ¼ cups light brown sugar packed
- 1 cup granulated sugar
- ½ teaspoon salt
- ½ teaspoon vanilla extract
- 12 ounce jar creamy peanut butter
- 1 stick butter softened
- ½ cup multi-colored chocolate candies
- ½ cup chocolate chips
- ¼ cup toffee bits optional
- ¼ cup mini chocolate chips optional
- 2 teaspoons baking soda
- 4 ½ cups quick-cooking oats not instant
Instructions
- Preheat the oven to 350℉. Line cookie sheets with parchment paper.
- In a very large mixing bowl, combine the eggs and sugars. Mix well. Add the salt, vanilla, peanut butter, and butter. Mix well. Stir in the chocolate candies, chocolate chips, toffee bits and mini chips, baking soda, and oatmeal.
- Drop by tablespoons 2 inches apart onto the prepared cookie sheets.
- Bake for 8 to 10 minutes. Do not overbake. Let stand for about 3 minutes before transferring to wire racks to cool.
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