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5.0 from 33 votes

Monster Cookie Bars

Soft, chewy Monster Cookie bars stuffed full of peanut butter chips and M&M's!

Prep Time
10 mins
Cook Time
10 mins
Total Time
25 mins
Servings: 20
Calories: 532 kcal
Course: Dessert
Cuisine: American

Ingredients

  • ½ cup butter softened
  • 3 eggs beaten
  • 1 cup white sugar
  • 1 teaspoon vanilla
  • 1 teaspoon corn syrup
  • 2 teaspoon baking soda
  • 1 cup brown sugar packed
  • 1 ½ cups peanut butter
  • 4 ½ cups quick oatmeal
  • 6 ounces chocolate chips
  • 6 ounces M&M's

Instructions

    Cup of Yum
  1. Preheat oven to 350 degrees Fahrenheit. Spray a 18x13 inch baking pan with non-stick spray. Set aside.
  2. In a large mixing bowl or bowl of a stand mixer, add butter and sugars. Beat together until creamed.
  3. Add eggs, vanilla, corn syrup, and baking soda and mix until just combined. Sir in peanut butter and mix until combined then stir in oatmeal and mix.
  4. Add chocolate chips and gently mix by hand until combined.
  5. Spread into a greased 18 x 13 inch pan. Sprinkle M&Ms on top of batter in a pan and gently press into the dough.
  6. Place in the oven and preheated at 350 degrees Fahrenheit for 15 minutes for a soft, chewy bar. They will not look done, but will cook as they set.

Notes

  • Place leftover bars into an airtight container with parchment paper between layers and store at room temperature for 3-4 days.
  • FRIDGE: To make this treat last a bit longer, store leftovers in the refrigerator for up to a week.
  • FREEZER: Monster cookie bars can be frozen too! Wrap each bar individually in plastic wrap or place them in an airtight container. Store in the freezer for up to 3 months. Allow to thaw before eating.
  • Mix it up and uses peanut butter chips and Reese's Pieces for a peanut butter Monster Bar!

Nutrition Information

Calories 532kcal (27%) Carbohydrates 72g (24%) Protein 16g (32%) Fat 22g (34%) Saturated Fat 9g (45%) Cholesterol 38mg (13%) Sodium 298mg (12%) Potassium 356mg (10%) Fiber 6g (24%) Sugar 33g (66%) Vitamin A 185IU (4%) Calcium 56mg (6%) Iron 3mg (17%)

Nutrition Facts

Serving: 20Serving

Amount Per Serving

Calories 532

% Daily Value*

Calories 532kcal 27%
Carbohydrates 72g 24%
Protein 16g 32%
Fat 22g 34%
Saturated Fat 9g 45%
Cholesterol 38mg 13%
Sodium 298mg 12%
Potassium 356mg 8%
Fiber 6g 24%
Sugar 33g 66%
Vitamin A 185IU 4%
Calcium 56mg 6%
Iron 3mg 17%

* Percent Daily Values are based on a 2,000 calorie diet.