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–+ servings
Monster Cookie Bars

Ultimate Monster Cookie Bars: Chewy Bliss in Every Bite

These Monster Cookie Bars are a delightful fusion of chocolate, peanut butter, and chewy oatmeal goodness, perfect for any dessert lover.
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Prep Time 15 minutes
Cook Time 30 minutes
Cooling Time 1 hour
Total Time 1 hour 45 minutes
Servings: 16 bars
Course: Desserts
Cuisine: American
Calories: 200
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Batter
  • 1 cup Salted Butter Substitution: Unsalted butter can be used, but add a pinch of salt.
  • 1 cup Peanut Butter Substitution: Almond butter or sunflower seed butter for nut-free version.
  • 1 cup Brown Sugar
  • 1 cup Granulated Sugar
  • 2 large Eggs Provides structure and moisture.
  • 2 teaspoons Vanilla Extract
  • 1 cup All-Purpose Flour Substitution: Gluten-free flour blend for gluten-free option.
  • 3 cups Rolled Oats Substitution: Quick oats can be used, but texture may vary.
  • 1 teaspoon Baking Soda
  • 1 teaspoon Baking Powder
  • 1/2 teaspoon Salt Enhances flavors.
For the Mix-Ins
  • 1 cup Semi-Sweet Chocolate Chips Substitution: Milk chocolate or dark chocolate chips for preference.
  • 1 cup M&Ms Substitution: Any candy or chocolate bits can be used.

Equipment

  • Mixing bowl
  • Electric mixer
  • 9x9-inch baking pan
  • Rubber spatula

Method
 

Step-by-Step Instructions for Monster Cookie Bars
  1. Preheat your oven to 350°F (180°C) and line a 9x9 inch baking pan with parchment paper.
  2. In a large mixing bowl, combine softened salted butter and creamy peanut butter with brown sugar and granulated sugar. Beat until light and fluffy, about 2-3 minutes.
  3. Beat in the eggs, one at a time, then add the vanilla extract and mix until blended.
  4. Gradually add in the flour, rolled oats, baking soda, baking powder, and salt. Mix on low until just combined.
  5. Fold in the chocolate chips and M&Ms with a spatula.
  6. Pour the dough into the prepared pan, spread it out evenly, and press it down firmly.
  7. Bake for 25-30 minutes until golden brown on top.
  8. Allow the bars to cool completely in the pan before cutting. Use parchment overhang to lift them out and slice.

Nutrition

Serving: 1barCalories: 200kcalCarbohydrates: 30gProtein: 3gFat: 9gSaturated Fat: 4gPolyunsaturated Fat: 1gMonounsaturated Fat: 2gCholesterol: 20mgSodium: 150mgPotassium: 100mgFiber: 1gSugar: 15gVitamin A: 100IUCalcium: 15mgIron: 1mg

Notes

Store your Monster Cookie Bars in an airtight container at room temperature for up to 4 days or freeze for later indulgence.

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