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Tasty Monster Cookie Bars Easy Spooky Halloween Treat Recipe

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These tasty monster cookie bars combine a chewy peanut butter base with colorful candy-coated chocolates and oats, making a quick and festive Halloween treat perfect for parties and last-minute baking.

Ingredients

Scale
  • 1 cup creamy peanut butter
  • 1 cup packed light brown sugar
  • 1/2 cup granulated sugar
  • 2 large eggs, room temperature
  • 2 teaspoons vanilla extract
  • 1 1/2 cups all-purpose flour (or gluten-free flour blend)
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 2 cups old-fashioned rolled oats
  • 1 cup M&M’s or candy-coated chocolates
  • 1/2 cup semi-sweet chocolate chips
  • Optional: 1/2 cup chopped walnuts or pecans

Instructions

  1. Preheat your oven to 350°F (175°C). Line a 9×13-inch pan with parchment paper or lightly grease it.
  2. In a large bowl, combine peanut butter, brown sugar, and granulated sugar. Mix until creamy and smooth, about 2-3 minutes.
  3. Add eggs one at a time, beating well after each addition. Stir in vanilla extract.
  4. In a separate bowl, whisk together flour, baking soda, and salt.
  5. Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
  6. Fold in rolled oats, M&M’s, chocolate chips, and optional nuts gently.
  7. Spread the batter evenly into the prepared pan, pressing down gently.
  8. Bake for 25-28 minutes, checking at 20 minutes to avoid overbaking. The center should be set but still soft.
  9. Cool completely on a wire rack for at least 30 minutes before slicing.
  10. Cut into 12 or 16 bars and store leftovers in an airtight container at room temperature for 3-4 days or freeze for longer storage.

Notes

Use old-fashioned rolled oats for best chewy texture; chilling the batter for 15 minutes before baking helps prevent spreading; avoid overbaking to keep bars soft and chewy; room temperature eggs mix better; parchment paper makes cleanup easier and helps lift bars out cleanly.

Nutrition

Keywords: monster cookie bars, Halloween treats, peanut butter bars, chewy cookie bars, easy Halloween dessert, candy cookie bars

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