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No-Bake Monster Cookie Bars

No-Bake Monster Cookie Bars

These No-Bake Monster Cookie Bars are chewy, colorful, and full of classic peanut butter and chocolate flavor. Made with oats, M&Ms, and chocolate chips, they’re the ultimate quick dessert or snack — no oven required and ready in minutes!
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Prep Time 20 minutes
Total Time 20 minutes
Servings: 16 bars
Course: Bars, Dessert
Cuisine: American
Calories: 240
Ingredients Method Notes

Ingredients
  

  • ½ cup unsalted butter
  • ¾ cup creamy peanut butter
  • ½ cup brown sugar packed
  • 1 tsp vanilla extract
  • ¼ tsp salt
  • 2 ½ cups old-fashioned rolled oats
  • ½ cup mini chocolate chips
  • ½ cup mini M&Ms
  • Optional: 2 tbsp honey or maple syrup for extra sweetness

Method
 

  1. Melt ingredients: In a medium saucepan, combine butter, peanut butter, and brown sugar. Heat over medium-low, stirring constantly until melted and smooth.
  2. Add flavorings: Remove from heat and stir in vanilla extract and salt.
  3. Add oats: Mix in rolled oats until fully coated with the peanut butter mixture.
  4. Cool slightly: Let the mixture cool for 5–10 minutes so the chocolate doesn’t melt too much.
  5. Fold in mix-ins: Stir in mini chocolate chips and M&Ms gently until evenly distributed.
  6. Press into pan: Line an 8×8-inch baking pan with parchment paper. Press the mixture firmly and evenly into the pan using a spatula or your hands.
  7. Chill: Refrigerate for 1 hour or until set and firm.
  8. Slice and serve: Lift from the pan using the parchment paper and cut into squares. Enjoy chilled or at room temperature!

Notes

  • Adjust texture: Add more oats if the mixture feels too soft or sticky.
  • Add-ins: Try pretzel pieces, shredded coconut, or chopped nuts for extra crunch.
  • Use natural peanut butter: If using, increase oats slightly since natural peanut butter is runnier.
  • Storage: Keep bars in an airtight container in the refrigerator for up to 7 days.
  • Freezing: Freeze for up to 2 months; thaw in the fridge before serving.
  • Serving tip: Drizzle melted chocolate or peanut butter over the top for a bakery-style finish.