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4.5 from 129 votes

Monster Cookie Bars

Monster cookies baked into bar cookies - peanut butter dough loaded with oats, chocolate chips and M&M's.

Prep Time
10 mins
Cook Time
10 mins
Total Time
25 mins
Servings: 24 bars
Calories: 224 kcal
Course: Snacks
Cuisine: American

Ingredients

  • ½ cup unsalted butter at room temperature
  • 1 cup light brown sugar
  • ½ cup creamy peanut butter
  • 1 egg
  • 2 teaspoons vanilla extract
  • ¾ cup all-purpose flour
  • 1 teaspoon baking soda
  • 1 teaspoon cornstarch
  • ¼ teaspoon baking powder
  • ¼ teaspoon salt
  • 1½ cups old-fashioned oats
  • 1 cup semisweet chocolate chips
  • 1 cup M&M's + additional for top of bars

Instructions

    Cup of Yum
  1. Preheat the oven to 350 degrees F. Grease a 9x13-inch paking pan and line with parchment paper so that it hangs over two sides.
  2. In a small bowl, whisk together the flour, baking soda, cornstarch, baking powder and salt.
  3. In a large bowl, cream together the butter, brown sugar, and peanut butter on medium speed until light and fluffy, about 3 minutes. Add the egg and vanilla, scraping down the sides of the bowl as needed. Reduce the mixer speed to low and slowly add the flour mixture to the wet ingredients and mix until just combined. Using a rubber spatula, stir in the oats, chocolate chips and M&M's by hand.
  4. Turn the dough out into the prepared baking sheet and press/spread into an even layer. Press additional M&M's onto the top of the dough. Bake for 15 to 17 minutes, until the edges are set and lightly browned and the top still looks slightly undercooked. Remove from the oven and cool completely before cutting into bars. The bars should be stored in an airtight container at room temperature for up to 4 days.

Notes

  • Nutritional values are based on one serving

Nutrition Information

Calories 224kcal (11%) Carbohydrates 26g (9%) Protein 3g (6%) Fat 11g (17%) Saturated Fat 6g (30%) Cholesterol 18mg (6%) Sodium 107mg (4%) Potassium 118mg (3%) Fiber 1g (4%) Sugar 17g (34%) Vitamin A 150IU (3%) Vitamin C 0.1mg (0%) Calcium 32mg (3%) Iron 1.2mg (7%)

Nutrition Facts

Serving: 24bars

Amount Per Serving

Calories 224

% Daily Value*

Calories 224kcal 11%
Carbohydrates 26g 9%
Protein 3g 6%
Fat 11g 17%
Saturated Fat 6g 30%
Cholesterol 18mg 6%
Sodium 107mg 4%
Potassium 118mg 3%
Fiber 1g 4%
Sugar 17g 34%
Vitamin A 150IU 3%
Vitamin C 0.1mg 0%
Calcium 32mg 3%
Iron 1.2mg 7%

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