Monster Cookie Bars Recipe

Jamie Lothridge | My Baking Addiction

Monster Cookie Bars make a tremendous treat any time of day. They're also great to take along to barbecues and birthday parties.

Monster Cookie Bars Photo

So Easter has come and gone, but since I’m a total holiday candy hoarder, we have a huge basket of the pastel, festive stuff stashed away in the pantry. And because we’re the best egg hiders on the planet, Elle is still locating those colorful plastic eggs filled with miniature candy bars, weeks later. I swear this kid is going to forever grow up thinking you can randomly find candy everywhere as long as you look in the right places.

I decided to take a proactive approach and attempt to reduce our candy stash – especially the M&M’s – because let me tell ya, Miss Elle is obsessed with them.

Monster Cookie Bars Picture

She’ll waddle over to the pantry and point to the basket uttering a little baby word that is undoubtedly her trying her hardest to say, “Mama, mama, M&M.” And let’s just say I can’t deal with the cuteness, so I usually drop one candy into her chubby baby palm. Minutes later, she’s following me around the house using the sign for more. Obsessed, I tell ya.

We love Monster cookies around here almost as much as we love the New York Times chocolate chip cookies and Reese’s Pieces peanut butter cookies. With loads of milk chocolate chips, M&M’s, oats and peanut butter how could Monster cookies ever be a bad thing?

Monster Cookie Bars Image

Last week, I whipped up this cookie batter with the intention of making a ton of cookies, but at the last minute decided to toss it all into one pan and bake up a batch of Monster cookie bars. Let’s just say I had the sudden urge to run to Target for a few home décor items and baking several batches of cookies was no longer a priority.

They baked up perfectly in about 30 minutes and by the time I returned from Target they were ready to sample. If I’m being honest, I most definitely prefer Monster cookies in bar form. They’re thick, chewy, just a little gooey, and definitely the perfect way to use up a little leftover Easter candy. I can only imagine how good these Monster Cookie Bars would be with chopped Snickers, Reese’s Cups or Twix.

Monster Cookie Bars Pic

If you’re hoarding leftover Easter candy like it’s your J-O-B, it’s time to let it go. You’ve got to make these Monster cookie bars STAT.

For more delicious cookie recipes, be sure to check out these giant M&M cookies and these chocolate chip pudding cookies. They are both sure to cure just about any cookie craving!

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Monster Cookie Bars Recipe

    16 Servings


  • 1/2 cup Unsalted Butter, room temperature
  • 1 1/2 cups Creamy Peanut Butter
  • 1 cup Light Brown Sugar, packed
  • 1 cup Granulated Sugar
  • 2 teaspoons Pure Vanilla Extract
  • 3 large Eggs
  • 2 teaspoons Baking Soda
  • 4 1/2 cups Rolled Oats
  • 1 cup Semisweet Chocolate Chips
  • 1 cup Milk Chocolate M&Ms


  1. Preheat oven to 350°F. Line a 9x13 inch baking pan with foil, leaving about 1 inch of the foil extending over the edges of the pan. The extra foil will create handles that you can use to lift the Monster Cookie Bars from the pan. Spray foil with nonstick cooking spray. Set pan aside.
  2. In the bowl of a stand mixer fitted with the paddle attachment, or in a large bowl with an electric mixer, cream butter, peanut butter and sugars on medium speed for about 3 minutes. Add in vanilla and eggs and mix until combined.
  3. Stir together the oats and baking soda and gradually add the oats into the butter mixture until thoroughly incorporated. Stir in chocolate chips and M&M candies.
  4. Spoon batter into prepared pan and spread into an even layer. If desired, top batter with an additional 1/4 cup M&M’s, pressing them lightly into the batter. Bake in preheated oven for 30-35 minutes. Remove pan to a cooling rack and cool completely before cutting into squares.


  • Monster Cookie Bars can be stored in an airtight container at room temperature for up to 3 days.


Source: Monster Cookie Bars are adapted from
Monster Cookie Bars are adapted from
Cooking Method:
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Related Recipes:
Cookie Recipes, Bar Dessert Recipes, Dessert Recipes, Candy Recipes, Baking Recipes, Baked Recipes, Party Food Recipes, Snack Recipes, Family Meals and Snack Recipes, Chocolate Recipes, Peanut Butter Recipes
Recipe Yields:
16 bars
Prep Time:
Cook Time:
Total Time:
Related Post:
Author: Jamie Lothridge
Source: Monster Cookie Bars are adapted from
Recipe Yields: 16 bars
Prep Time: 10 minutes
Cook Time: 35 minutes
Total Time: 45 minutes

Nutrition Facts

Serving Size 1 bar
Servings Per Recipe 16

Amount Per Serving
Calories from Fat 201
Calories 431

% Daily Value*
Total Fat 25g
  Saturated Fat 10g
Sodium 187mg
Total Carbohydrate 46g
  Dietary Fiber 1g
  Sugars 42g
Protein 8g

* Percent Daily Value are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
** Nutrition Facts are estimated based on ingredients and data provided by Fat Secret. Please consult a doctor if you have special dietary needs.
Jamie Lothridge

About Jamie

Jamie has an addiction to all things baking, as you'd guess from her blog, My Baking Addiction. She creates all things cookies just for us Food Fanatics, though.

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