Trick or Treat? Get ready for a monstrously delicious treat this Halloween with these spooky Monster Cookie Bars! Whether you’re baking for a kid’s party, a classroom treat, or just looking to satisfy your sweet tooth, these festive bars will surely be a hit among both kids and adults alike.
Chewy, buttery, delicious Halloween monster cookie bars are going to put a spell on you this Halloween season. A homemade monster cookie bar made with old-fashioned oats, semi-sweet chocolate chips, peanut butter, Ghoul mix M&M’s, and more. All the flavors of a classic monster cookie bar but with a Halloween vibe.
The candy eyes are the perfect addition to give the bars that spooky vibe that is great for the Halloween season. These are sliceable cookie bar that is hard to resist eating more than one! The best part of all, you mix, pour, and bake. Simple and easy to prep.
These cookie bars are perfect for serving up a larger crowd. Plus the bright-colored M&M’s and candy eyes make it a great piece to add a pop of color to a dessert table. A tasty Halloween bar recipe that will get your family excited for dessert.
Use this pumpkin spice creamer to make a cup of coffee and sip and enjoy as you snack on one of these sweet cookie bars. Fall will totally be in the air with these two treats.
Reasons You Will Love These Halloween Monster Cookie Bars
- These Halloween monster cookie bars are so easy to make. Just mix, pour, and bake. There is no batch cooking like you would cookies.
- The bars offer a nice chewy, crunchy and soft texture with all the ingredients used in them.
- Great for Halloween season or even just fall. I loved the Halloween M&M’s as it captures the Halloween season perfectly.
- Versatile in how you top and decorate your cookie bars. Have fun with candy corn and other fall candies to change up the appearance.
- You can make these bars a day ahead of time from when you plan to serve it up. Then just serve up when you are ready.
Giftable Halloween Treat
If you are on the hunt for a fun dessert to gift co-workers, school parties, neighbors or more, this is it. Place your bars in individual wrapped cellophane with ribbon and such to create a fun homemade Halloween gift.
You could even sit in a coffee mug with some hot chocolate packets, tea, K-cups, etc. Then it could be a full gift in one.
Ingredients Needed
Flour – Make sure to scoop the flour into the measuring cup. Then level it off.
Oats – Old fashioned oats are going to offer a really nice chewy texture to the cookie bars.
Baking Soda – This will help the cookie bars rise and create the perfect soft and chewy texture.
Salt – Salt is a must when you bake. It is going to bring life to the cookies and ballance the sweet flavors.
Butter – Unsalted butter that is room temperature. Make sure if you use salted butter you leave out the salt in the bar recipe.
Peanut Butter – I prefer creamy peanut butter. But feel free to swap to a crunchy peanut butter if you want.
Sugar – Brown sugar and granulated sugar are both used. It really elevates the whole vibe of the cookie bars.
Egg – Room temperature eggs will mix in better to the batter ensuring they are fully incorporated.
Vanilla – A splash of vanilla really brings out more flavor to the whole dessert.
M&M’s – If you can get your hands on the Halloween Ghoul’s M&M’s give them a try. They are bright Halloween colors!
Peanut Butter Chips – You find these in the baking aisle and they are so good in these bars.
Chocolate Chips – I used semi-sweet but milk chocolate or even a dark chocolate can work just as good.
Candy eyeballs – These are found in the baking aisle. They just really elevate the level of Halloween I think to give it a monster vibe.
Variations to Recipe
- Mix in chopped candy bars or leftover Halloween candy!
- Swap out the chocolate chips with a white chocolate chip or even butterscotch.
- Use a nut butter instead of peanut butter.
- Quick oats can be used. The cookie bars just won’t be as chewy.
- Use browned butter in replace of regular butter in the recipe for a richer and nutty flavor.
- Decorate with crushed cookies, Halloween candy, etc.
- Drizzle on melted candy melts on top of the bars for a twist in design.
- Do 1/2 teaspoon of pumpkin spice seasoning for a fall flavor.
- Swirl on some salted caramel sauce for a gooey twist.
- Toss in 1/3 cup of shredded coconut for added chewy texture.
- 1/2 cup of nuts can be added. Chopped pecans are a great additon.
- Mix in dried raisins or cranberries for a sweet fruity twist.
Tips for Success
Cream Sugar and Butter
Taking time to cream the butter and sugar for 2-3 minutes is going to transform the texture but also richen the flavor of the cookie bars. You will get a nice light and fluffy texture.
Fold In The Candies
Make sure to fold in the chocolate chips and M&M’s. If you use a hand or stand mixer it will break up the candies and you wont have that gorgeous finished look.
Don’t Over Bake
Watch the cookie bars and make sure to not overbake. Otherwise it can leave your cookies a bit dry. use the cook time as a guide. Depending on elevation, humidity, etc. the cook time can vary.
Room Temperature Ingredients
Using room temperature ingredients like butter and eggs is going to help ensure all the ingredients incorporate properly. So make sure to take time to set them out before you go to baking.
Lining Pan
Lining the pan with parchment paper is going to help give you an easy way to get the bars out without them breaking. Leave room at the top so you can grab the paper and lift up once the bars have cooled.
Topping With Candies
When you go to bake adding extra candies right on top of the bars is going to give you a gorgeous look like a bakery. Just lighly press the M&M’s and such into the top of the dough.
Clean Cuts
Make sure your bars are fully cooled before you go to slice in them if you want that gorgeous clean cut. Then use a sharp knife for even slice strokes for that nice smooth look. If you slice while still hot you get crumbles.
Storing
Room Temperature: Store the bars in a sealed airtight container at room temperature for around 4-5 days. The longer the bars sit the drier they will become. But you can soften them up a bit by microwaving. Just place a bar in the microwave and heat for 10 seconds or so. Once warm remove and enjoy.
Freezing: You can also freeze any of the bars you don’t plan to eat. Place in a freezer bag or container and freeze for 2-3 months. Thaw on the counter and enjoy.
FAQs
Can I use store-bought cookie dough for Monster Cookie Bars?
You could use store bought cookie dough as the base. I would recommend using a chocolate chip cookie. Then add in some oats, peanut butter chips, and M&M’s. Just know the texture will be different and flavor.
How do I prevent the bars from becoming too soft or crumbly?
Make sure you mix and fully bake your cookie bars. A lot of times if your bars fall apart they were not fully cooked and can begin to crumble.
Can I use gluten-free flour for Monster Cookie Bars?
Go right ahead and use a gluten free flour if you want. Just know depending on the flour you might need to adjust the recipe slightly.
Can I add a frosting to the bars?
Go right ahead and reach for a canned frosting or make a homemade frosting and spread on top. Then decorate the top of bars with sprinkles, candy eyes, and M&M’s.
They’re quick and easy to make, and the perfect way to celebrate the spookiest time of the year. Let’s get baking! And there you have it, creepy and delicious Halloween Monster Cookie Bars to satisfy everyone’s sweet tooth during the spooky season! Serve these up at a Halloween party, share them with friends, or enjoy them all by yourself (we won’t tell ????)
More Desserts
Halloween Monster Cookie Bars
Ingredients
- 2 cups all-purpose flour 250 grams
- 1 ½ cups old-fashioned oats 120 grams
- 1 teaspoon baking soda
- ¼ teaspoon salt
- ½ cup unsalted butter room temperature (113 grams)
- ½ cup creamy peanut butter 128 grams
- ½ cup granulated sugar 100 grams
- ½ cup brown sugar lightly packed (100 grams)
- 2 large eggs room temperature
- 2 teaspoons vanilla extract
- 1 cup Ghoul mix M&M’s divided (165 grams)
- ½ cup semi-sweet chocolate chips divided (85 grams)
- ½ cup peanut butter chips divided (120 grams)
- Candy eyeballs to decorate optional
Instructions
- Preheat the oven to 350 degrees F. Line the bottom and sides of a 9×9 inch baking pan with parchment paper and set aside.
- Whisk together the flour, oats, baking soda, and salt in a medium bowl and set aside.
- In a large bowl, beat the butter, peanut butter, and sugars with a hand or stand mixer until light and fluffy.
- Scape the sides of the bowl and beat in the eggs and vanilla until well combined.
- Scrape the bowl again and add the flour and oat mixture. Mix until just combined, do not overmix.
- Set aside ¼ cup of M&Ms and two tablespoons each of the chocolate and peanut butter chips. Fold the remaining M&Ms, chocolate, and peanut butter chips into the cookie dough.
- Turn the cookie dough into the prepared pan and gently press into an even layer smoothing the top with a rubber spatula or the back of a spoon.
- Scatter the M&Ms, chocolate, and peanut butter chips that you set aside over the top of the cookie dough and gently press down.
- Bake for 22-28 minutes or until the edges have set and a toothpick inserted into the center comes out clean.
- Press the candy eyeballs into the cookie bars while they are warm, then allow them to cool completely in the pan before removing and cutting them into squares.
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