Monster Cookie Bars

Prep 10 min
Total 1 hr 30 min
Servings 24

This recipe for chewy monster cookie bars has everything you love about classic monster cookies, but with a few tweaks to make them bake up as perfect bars. These soft and chewy bars are packed with peanuts, chocolate chips, M&M's® and oats - the perfect balance of sweet and salty. It’s easy to make and takes only 10 minutes to prep with the help of a pouch of Betty Crocker™ peanut butter cookie mix. We love packing these flavor-filled monster cookie bars for lunch, keeping them on hand as a midday snack, or enjoying them topped with a scoop of vanilla ice cream for a deliciously indulgent dessert. MORE+ LESS-

By Betty Crocker Kitchens

Updated September 11, 2020

Make with

Betty Crocker Cookie Mix

Ingredients

pouch (17.5 oz) Betty Crocker™ peanut butter cookie mix

Vegetable oil, water and egg called for on cookie mix pouch

2/3

cup creamy peanut butter

cup old-fashioned oats

1/2

cup M&M's® chocolate candies

1/2

cup semisweet chocolate chips

1/3

cup finely chopped cocktail peanuts

Steps

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1

Heat oven to 350°F. Spray bottom and sides of 13x9-inch pan with cooking spray.
2

In large bowl, mix cookie mix, oil, water, egg, peanut butter and oats with spoon until mixture comes together. Stir in candies, chocolate chips and peanuts. Press dough in bottom of pan.
3

Bake 16 to 20 minutes or until light golden brown. Cool completely on cooling rack, about 1 hour. Cut into 6 rows by 4 rows. Store in airtight container.

Expert Tips

Change the look and flavor of your monster cookies by substituting in a different kind of nut, adding in raisins, or substituting butterscotch or white chocolate chips instead of classic chocolate. There are countless ways you can customize this simple and delicious recipe to make it your own.
Transform these monster cookie bars easily into Christmas monster cookies bars by sticking to only green and red M&M's®!
Make both cutting your bars and then cleaning up afterward a breeze. Line the pan with heavy-duty or nonstick foil making sure to let the foil be higher on the pan than the cookie bar mix. After baking when it is time to cut the bars, just use the foil to lift the baked cookie bar out of the pan and then cut your pieces.
For more delicious ways to transform a pouch of Betty Crocker™ peanut butter cookie mix into delicious and decadent bars, try our family-favorite recipes for Layered Peanut Butter Bars or Chocolate-Cream-Cheese-Peanut Butter Bars.