Monster Cookie No Bake Bars

4.49 from 86 votes
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Monster Cookie No Bake Bars – all the flavors of classic monster cookies in a super easy no bake bar recipe.  No heating up the oven to make these!

No bake desserts are some of my favorite things to make. They are great in the summer to avoid the heat of the oven, but the rest of the year they are just quick and easy! And if you like peanut butter, chocolate, and anything Monster cookie like these no bake bars are a must!

monster cookie no bake bars on a plate


These Monster Cookie Bars are a no bake recipe that has all the flavor of traditional monster cookies, but in a super quick and easy bar form.

  • Peanut Butter
  • Butter
  • Sugar
  • Brown Sugar
  • Flour
  • Vanilla Extract
  • Heavy Cream
  • Old Fashioned Oats
  • M&M’s
  • Chocolate Chips

The heavy cream looks a little odd on the list, but that helps make the chocolate topping stay a little bit soft so you can slice these into bars.

monster cookie no bake bars on a plate

Warning! This recipe contains flour. It is not safe to consume raw flour, there is a chance of bacteria that can make you sick. But there is a very easy solution!

How To Make Raw Flour Safe To Eat

There are 2 simple ways to make flour safe to eat. You really just need to heat it to 160 degrees F to kill any bacteria.

  1. Place the flour in a microwave safe bowl and heat for one minute. You can test the temperature with a probe thermometer.
  2. Spread flour on a baking sheet and bake for 5 minutes at 350 degrees F.
No Bake Treats Book Review

This No Bake Monster Cookie Bars recipe comes from the new No-Bake Treats: Incredible Unbaked Cheesecakes, Icebox Cakes, Pies and More book by Julianne Bayer from the blog Beyond Frosting. If you like no bake desserts at all, you have to get this book.  It has everything from cheesecakes to dips to bars like this one, and way more. I had a really hard time deciding what to make first, and my son has marked about 25 recipes I need to make immediately. So we are not even close to done with this book! Every recipe has a gorgeous picture to go along with it as well.

monster cookie no bake bars on a plate
  1. Cream together the butter, sugar, and brown sugar until it is nice and smooth.
  2. Add in the peanut butter and mix until everything is well combined.
  3. Stir in the flour and the vanilla extract.
  4. Next add in the oats 1 cup at a time. This ensures that you can get them evenly mixed throughout the dough.
  5. Finally fold in the M&M’s and press into a 9 inch square pan.
  6. While the bars set up, melt the heavy cream and chocolate chips together for the topping. Pour over the top and sprinkle more M&M’s on top.
  7. You can place these in the fridge for the chocolate to set, or let them sit at room temperature for a few hours before slicing.

Store monster cookie bars in an air tight container. I like to store them in the fridge so the chocolate stays set. Take them out and let them come to room temperature before serving, so they are creamy and absolutely delicious!

up close stack of monster cookie bars

More No Bake Treats

Monster Cookie No Bake Bars - all the flavors of classic monster cookies in a super easy no bake bar recipe. No heating up the oven to make these!
4.49 from 86 votes
By Erin
Monster Cookie No Bake Bars – all the flavors of classic monster cookies in a super easy no bake bar recipe. No heating up the oven to make these!
Prep: 15 minutes
Total: 15 minutes
Servings: 16


Cookie Dough

  • 1/2 cup butter, , softened
  • 1/2 cup granulated sugar
  • 1/4 cup light brown sugar
  • 1 cup creamy peanut butter
  • 1/2 cup all-purpose flour
  • 1 teaspoon vanilla extract
  • 2 cups old fashioned oats
  • 3/4 cup mini M&M’s



  • Line a 9 inch baking dish with foil or parchment paper.
  • Combine butter, sugar, and brown sugar together in a large bowl. Mix at medium speed until combined. Add peanut butter and mix until well blended.
  • Stir in flour (see notes for eating raw flour) and vanilla; mixing until just incorporated. Slowly add oats, 1 cup at a time. Fold in M&M's. Press into prepared pan.
  • In a microwave safe bowl melt together chocolate and heavy cream, in 30 second increments. Once smooth, pour over cookie dough mixture. Sprinkle with remaining M&M's.
  • Refrigerate for 1-2 hours, or until chocolate is completely set up before serving.



Raw flour is not safe to eat. You can microwave for 1 minute, or bake at 350 degrees F for 5 minutes.
Recipe slightly adapted from No Bake Treats by Julianne Bayer


Serving: 1g | Calories: 383kcal | Carbohydrates: 41g | Protein: 7g | Fat: 23g | Saturated Fat: 11g | Polyunsaturated Fat: 10g | Cholesterol: 23mg | Sodium: 135mg | Fiber: 3g | Sugar: 26g

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Author: Erin
Prep Time: 15 minutes
Total Time: 15 minutes
Course: Dessert Recipes
Cuisine: American
Servings: 16
Calories: 383
Keyword: monster cookie bars
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About Erin S

Welcome to Dinners, Dishes, & Desserts where my love of food meets my busy life. My name is Erin and I’m a casual home cook who loves to feed people. On this blog, you’ll find hundreds of quick and easy recipes made mostly from scratch. My days are spent in the kitchen, creating new recipes to share with family and friends.

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  1. These treats could be my one of my favorites! The idea of turning on the oven during the summer is torture…but I need my treats 😉 Love!

  2. I now have a huge craving for one of these bars. Not kidding – I’m not going to be able to stop thinking about them tonight!

  3. These sound amazing! I’ve been dying to pick up a copy of that cookbook–they all sound amazing!

  4. Hi Erin! Thank you so so much for sharing! I am so glad your friend got a chance to make these. This is exactly why I love no-bake desserts. Even if you aren’t the best baker, you can still do it! Enjoy the rest of your summer!

    1. Store in an air tight container in the fridge if your house is warm so the chocolate stays set. I like to let them come to room temperature before serving.