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–+ servings
Stack of monster cookie bars with vanilla ice cream scoop on top and chocolate sauce
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Monster Cookie Bars

Monster Cookie Bars - this easy bar cookie recipe is full of peanut butter, oats, and tons of M&Ms! EVERYONE loves these, especially with ice cream!
Total Time 45 minutes
Servings 24 bars
Author Dorothy Kern

Ingredients

  • 1/2 cup unsalted butter softened
  • 1 cup peanut butter
  • 3/4 cup packed brown sugar
  • 1/2 cup granulated sugar
  • 2 large eggs
  • 1 tablespoon vanilla extract
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon salt
  • 3/4 cup all-purpose flour
  • 3 cups quick cooking oats
  • 1 cup chocolate chips
  • 2 cups M&Ms any kind, I used regular and peanut butter
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Instructions

  • Preheat oven to 350°F. Line a 9x13” pan with foil and spray with nonstick cooking spray.
  • Beat butter and peanut butter with a hand or a stand mixer until smooth. Mix in both sugars until creamy. Add eggs, vanilla, baking soda, and salt and mix until smooth, then slowly mix in the flour and oats. Stir in the chocolate chips and M&Ms.
  • Press cookie dough into the prepared pan. If desired, sprinkle more M&Ms on top for decoration. Bake for 22-25 minutes or just until the edges are golden brown. Cool before cutting into bars.
  • These are great served as bars or as an ice cream sundae! Store in an airtight container for up to 3 days or freeze for up to one month.