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Classic Monster Cookie Bars Recipe

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  • Author: Linda
  • Prep Time: 15 minutes
  • Cook Time: 25 minutes
  • Total Time: 1 hour
  • Yield: 24 bars
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Description

Classic Monster Cookie Bars are thick, chewy bars loaded with oats, peanut butter, chocolate chips, and colorful candy-coated chocolates. They’re easy to make, fun to eat, and perfect for any crowd.


Ingredients

  • 1 cup unsalted butter, softened
  • 1 cup brown sugar
  • 1/2 cup granulated sugar
  • 2 large eggs
  • 1 cup creamy peanut butter
  • 1 tsp vanilla extract
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 2 cups old-fashioned oats
  • 1 cup all-purpose flour
  • 1 cup semi-sweet chocolate chips
  • 1 cup candy-coated chocolates (e.g., M&M’s), divided

Instructions

  1. Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper.
  2. Cream together butter, brown sugar, and granulated sugar until light and fluffy.
  3. Beat in eggs one at a time. Add peanut butter and vanilla, and mix until smooth.
  4. Stir in baking soda and salt, then add oats and flour until just combined.
  5. Fold in chocolate chips and most of the candy-coated chocolates, reserving some for the top.
  6. Spread dough evenly into the prepared pan. Press remaining candies on top.
  7. Bake for 20–25 minutes, until edges are golden and center is just set.
  8. Cool completely in the pan before slicing into bars.

Notes

  • Swap peanut butter for almond or sunflower seed butter for nut-free option.
  • Add chopped pretzels, coconut, or seasonal candies for variety.
  • Use quick oats in place of old-fashioned oats if needed.
  • Freeze individually wrapped bars for up to 2 months.
  • Microwave bars for 10 seconds to enjoy warm and gooey.

Nutrition

  • Serving Size: 1 bar
  • Calories: 260
  • Sugar: 20g
  • Sodium: 140mg
  • Fat: 14g
  • Saturated Fat: 6g
  • Unsaturated Fat: 7g
  • Trans Fat: 0g
  • Carbohydrates: 30g
  • Fiber: 2g
  • Protein: 5g
  • Cholesterol: 30mg