Monster Cookies are fully loaded with peanut butter, mini M&M’s, oats and topped with a chocolate drizzle. An easy, irresistible cookie bar recipe.
If you are a cookie lover but can’t pick which one you want, Monster Cookies are always the right choice.
Chock full of the best of every type of cookie, the moist chewy cookie bar always satisfies cookie cravings!
What are Monster Cookies?
Combine the recipes for chocolate chip cookies, peanut butter cookies and oatmeal cookies you end up with a Monster cookie recipe.
It’s a ‘super cookie’ full of favorite ingredients!
Monster Cookie Ingredients
What’s in the Monster Cookies? Take a look!
- All Purpose Flour (regular or gluten-free)
- Baking Soda
- Kosher Salt
- Old Fashioned Oats
- Unsalted Butter
- Peanut Butter
- Brown Sugar
- Granulated Sugar
- Egg
- Vanilla Extract
- Mini M&Ms
- Chocolate Chips
Key Cookie Bar Recipe Ingredients
Old Fashioned Oats
Old Fashioned Oats hold their shape and add fantastic texture to the Monster Cookies. They lend a homey flavor too.
I prefer these over Quick Oats which tend to blend into the cookie bar recipe.
If gluten-free, be sure to use gluten-free certified oats. Several brands sell them under the name ‘Old Fashioned Rolled Oats’.
Mini M&Ms
Traditionally most Monster Cookie recipes use regular size M&M’s. Those can be substituted.
I prefer the mini M&M version in this recipe.
There are more M&M’s in the Monster cookie recipe when they are mini.
More is better, right?
Peanut Butter
Peanut Butter gives so much flavor in this recipe!
Use Smooth or Chunky style peanut butter. Either works great. Pick your favorite texture.
Chocolate Chips
Usually the chocolate chips are included IN the Monster Cookies.
This recipe is changed up to melt them to drizzle on top of the cookie bar recipe.
And then more mini M&Ms are added on top of the melted chocolate!
Make Gluten-Free Monster Cookies
To make this easy cookie bar recipe gluten-free swap these ingredients:
Gluten-Free Flour
Use a measure-for-measure gluten-free flour blend. It will provide a similar texture to regular all purpose flour.
There are many choices for this type of flour. I’ve used Bob’s Red Mill 1-to-1 flour in this recipe.
Gluten-Free Rolled Oats
Ensure the oats used are certified gluten-free. Do not use Instant Oats.
How to Make Monster Cookies – Step-by-Step
Make this cookie bar recipe just once and you’ll be hooked. It’s SO easy!
For a detailed printable recipe refer to the printable recipe card at the end of the blog post.
STEP 1: Preheat oven to 350 degrees. Line a 9×9 inch square pan with parchment paper or foil (sprayed with cooking spray).
STEP 2: In a bowl, whisk together flour, baking soda, salt, and oats (photo 1).
STEP 3: In a second large bowl cream together butter, peanut butter, and sugars (photo 2).
STEP 4: Add egg and vanilla extract and beat for an additional 2 minutes (photo 3).
STEP 5: Gradually combine the dry ingredients and wet ingredients mixing just until combined.
STEP 6: Stir in M&M’s (photo 4).
STEP 7: Evenly press dough into the prepared pan.
STEP 8: Bake bars for 18-20 minutes or until edges are golden. A toothpick inserted into the center and should come out clean.
STEP 9: Cool completely on cooling rack.
STEP 10: Melt chocolate chips in the microwave and whisk until smooth.
STEP 11: Drizzle melted chocolate over bars and top with extra mini M&M’s.
STEP 12: Let chocolate drizzle harden for about 30 minutes at room temperature or refrigerate for 15 minutes before slicing.
Cut bars into 9 large squares or 12 mini squares.
How to Store Monster Cookies
Put fully cooled Monster Cookies in an airtight container.
Cookies should be layered with wax paper or parchment paper in between layers. This prevents them sticking together.
Room Temperature
Store cookies at room temperature for up to 3 days.
Refrigerator
They may also be kept in the refrigerator for up to a week.
Freezer
The Monster Cookies can also be kept in the freezer for up to 6 months.
More Baked Dessert Recipes You’ll Love
- Turtle Brownies in Jelly Jars
- Zucchini Chocolate Chip Bundt Cake
- Chocolate Peppermint Oreo Brownies
- Rustic Plum Cake
- Great Grandma Jean’s Apple Pie
- Cranberry White Chocolate Pecan cookies
- Raspberry Cheesecake Cookies
Try These Easy Dinner Recipes too
- Slow Cooker Baby Back Ribs with Blackberry Preserves
- Hasselback Sweet Potatoes with Creamed Chipotle Turkey
- Braised Chicken Thighs with Cherries
- 18 Easy 30-Minute Weeknight Dinner Recipes
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Jennifer says
I love monster cookie bars. These look so delicious and decadent.
Catalina says
These Monster Cookies are so colorful and delicious! Definitely a favorite in our house!
Annemarie LeBlanc says
I like the name of this cookie! Fully loaded and delicious. I am sure my grandchildren would go nuts over these treats. Monster cookies for my cookie monsters!
Laura says
Wow what a great idea! I can’t imagine anyone not loving this dessert. Great addition for Christmas cookies this year.
Celebrate Woman Today says
It is a fully loaded bar! Lots of candy and sweets for one bite!
kita says
These look so good I am a cookie mosnter litearlly that is what they called me back in high school lol. I still love cookies but I gotta lay off of it.
Kathy says
These look amazing. I have made monster cookies before, just not like this. I’ll have to try this recipe next.
Amy Desrosiers says
These look so incredible! They are perfect for leftover halloween candy too! Yum!
Brianne Tursi Manz says
My kids would love these! Soft cookies are the best, and this recipe is so cool and they look delicious!
Anna says
My kids love these cookie bars! They are so fun to make!
Sara Welch says
Such a delicious treat; brings back fond childhood memories! Can’t wait to make a batch!
Kim says
I’ve never met a Monster Cookie I didn’t love! Can’t wait to try your recipe!
Tara Pittman says
These look so amazing. These would be great to make with leftover halloween candy
Toni Dash says
Yes!!
Stacie says
Those look fantastic! I need to make up a batch of these this weekend. My kids are going to love them.
Lindsay Cotter says
These were super easy to make! I’m sure they are going to disappear fast! So yum!
jill nunn says
Oh my YUM! These look so good! I LOOOOVE soft cookies and these look perfect!
Heather says
Monster cookies look and sound delicious! I know my kids would go nuts over these.
lisa says
my mouth is watering just looking at those pictures! oh a slice of that & a cup of coffee >>>> yes please
Lauren Kelly says
These are amazing and have always been my favorite! I love your recipes!
Jocelyn (Grandbaby Cakes) says
I am so in love with these cookies! Pass me a dozen pronto!!
Jenn says
The little kid in me REALLY wants to make these – and I know my kids will love them too! I’m off to get some M&Ms to make them! YUM!
Lisa | Garlic & Zest says
Seriously indulgent! I’m going to have to wait for a big gathering to make these, otherwise I risk eating the whole pan myself!
Aimee Mars says
So, I think I’ll make these into a super monster cookie and just not cut them up. Just eat the whole pan!! These look amazing.
Demeter says
I love that you used mini m&ms in these cookies. They look fantastically loaded!
robin rue says
You had me at cookie. This recipe is definitley up there and my family is going to love it.