Monster Cookie Bars

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Monster Cookie Bars have all the peanut buttery, chocolatey, chewy goodness of the traditional cookie, only in super easy bar form. 

Monster Cookie Bars - Classic Cookies in easy bar recipe form.

I have a well-established love of bars and bar cookies.

From Peanut Butter Cookie Bars to Apple Blondies, Brownies to fruit-filled Pie Bars, and oh my heart and happy taste buds, Cheesecake Bars too – they all make me happy both because they’re absolutely delicious and they’re so very easy to make!

Bars are so much easier and quicker to make than cookies. Cookies can be finicky; they need perfect ratios of flour, sugar, and butter, or they will spread flat or won’t spread at all.

With bars, there is a lot more leeway. With sides on a pan, the dough can’t go anywhere, not to mention it saves all the time rolling, and chilling, and baking individual cookie sheets of dough.

Monster Cookie Bars

These are just perfect for an afternoon snack with a cold glass of milk. And luckily, it only takes a few minutes to stir a batch together.

My boys absolutely love these and they’ve become a serious favorite over the years.

One hour max start to finish, even if you have to Google how to crack an egg first. What excuse do you have for not making them?

Monster Cookie Bars are a kid favorite

These soft and chewy monster bars are easy to make!

Simply cream the butter and sugars together, beat in peanut butter, eggs, and vanilla and stir in the dry ingredients.

Last of all, you’ll fold in some chocolate chips and M&Ms. Press the monster cookie dough into a 9 x 13 pan and bake.

As hard as it is to wait, try to let them cool completely before slicing them into bars.

Monster Cookie Bars - Classic Cookies in easy bar recipe form.

For a few more chocolate and oatmeal dessert combinations to try, don’t miss these Cranberry White Chocolate Oatmeal Cookies and the Chocolate Revel Bars.

These Double Decker M&M Brownies from Whisking Up Yum are calling my name now too!

Monster Cookie Bars - Classic Cookies in easy bar recipe form.

Monster Cookie Bars

4.86 from 7 votes
These monster cookie bars have all the peanut buttery, chocolatey, chewy goodness of the traditional cookie, only in super easy bar form.
Prep Time: 15 mins
Cook Time: 15 mins
Additional Time: 1 hr
Total Time: 1 hr 30 mins
Cuisine: American
Servings: 2 dozen bars

Ingredients 

  • 1/2 cup butter softened
  • 1 cup brown sugar
  • 1/2 cup peanut butter
  • 2 eggs
  • 1 tsp vanilla
  • 1 and 3/4 cup all purpose flour
  • 1 tsp baking soda
  • 1 tsp salt
  • 1 and 3/4 cup quick cooking oats
  • 3/4 cup semi-sweet chocolate chips
  • 1 cup M&Ms

Instructions

  • Preheat oven to 350 F. Grease a 9 x 13 pan and set aside.
  • In a large bowl, cream together butter and brown sugar. Beat in peanut butter, eggs and vanilla.
  • In a separate bowl, stir together flour, soda and salt. Add to large bowl and stir until combined. Add oats, chocolate chips and M&Ms.
  • Press into greased pan. Add additional M&Ms to the top, if desired, pressing them into the dough slightly.
  • Bake for 14 – 16 minutes or until edges are slightly brown or until toothpick inserted comes out clean. Do not over bake. Let cool a bit before slicing. Letting them cool completely is best. But its almost impossible to wait that long.

Nutrition

Serving: 1g · Calories: 194kcal · Carbohydrates: 23g · Protein: 3g · Fat: 11g · Saturated Fat: 5g · Polyunsaturated Fat: 4g · Cholesterol: 27mg · Sodium: 220mg · Fiber: 1g · Sugar: 16g
Tried this recipe?Mention @chocolatewithgrace or tag #chocolatewithgrace!

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{originally published 8/19/14 – recipe notes and photos updated 1/4/21}

Classic Lemon Bars

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Monster Cookie Bars
Monster Cookie Bars are chocolate, peanut butter happiness!

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  1. Ryann says

    Hello, can I omit the peanut butter? Can I replace it with something else. or just leave it out all together?

  2. Sara says

    5 stars
    These bars are delicious! But I almost never have quick oats on hand, do you think regular rolled oats would work as well?

  3. Ana Agundez says

    I followed the directions and all I got was a dry flour mixture. I went over the directions three times and cannot find my mistake.

    • Mary says

      Without being in your kitchen with you, it’s hard to guess what might have gone wrong, Ana. By chance were you scooping and or shaking your flour vs spooning it into the cup and leveling it off? That’s the most common way that too much flour is added to baked goods. (And that may have created a drier dough for the recipe.)

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