Monster Cookie Bars

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

Salty sweet graham cracker toffee is perfect for snacking on its own or crumbling over ice cream.

Monster Cookie Bars

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.

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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?

How to make Monster Cookie Bars

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.

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!

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4.34 from 12 votes

Monster Cookie Bars

Mary Younkin

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 minutes mins

Cook Time: 15 minutes mins

Additional Time: 1 hour hr

Total Time: 1 hour hr 30 minutes mins

Servings: 2 dozen bars

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Ingredients 

1x2x3x

• ▢ ½ cup butter softened
• ▢ 1 cup brown sugar
• ▢ ½ cup peanut butter
• ▢ 2 eggs
• ▢ 1 tsp vanilla
• ▢ 1¾ cup all purpose flour
• ▢ 1 tsp baking soda
• ▢ 1¾ cup quick cooking oats
• ▢ ¾ 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, and baking soda. 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.

Notes

I use salted butter to make this recipe. If you prefer to use unsalted butter, you might want to add a pinch of salt to this recipe.

Nutrition

Serving: 1 g | Calories: 194 kcal | Carbohydrates: 23 g | Protein: 3 g | Fat: 11 g | Saturated Fat: 5 g | Polyunsaturated Fat: 4 g | Cholesterol: 27 mg | Sodium: 220 mg | Fiber: 1 g | Sugar: 16 g

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

Did you make this? Leave a comment below!

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

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