Monster Cookie Bars are a chewy, colorful, and delightfully indulgent treat packed with peanut butter, oats, chocolate chips, and candy-coated chocolates. They’re thick, soft, and perfectly sweet — everything you love about classic monster cookies, but baked into easy-to-slice bars.
Monster Cookie Bars:
These bars are a crowd-pleaser for all ages, ideal for parties, lunchboxes, or an afternoon pick-me-up. With their bright M&M toppings and rich, nutty flavor, Monster Cookie Bars deliver the perfect balance of texture and taste — chewy, crunchy, and chocolaty in every bite.
History:
Monster cookies were first popularized in the Midwest of the United States, believed to have originated as a creative way to use leftover baking ingredients. The recipe combined oatmeal, peanut butter, chocolate chips, and colorful candies — resulting in a “monster” mix of everything delicious. Over time, bakers adapted the recipe into bars for easier baking and serving, turning the classic cookie into a no-fuss dessert favorite.
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Monster Cookie Bars
Ingredients
- ½ cup (1 stick) unsalted butter, melted
- 1 cup brown sugar, packed
- ½ cup creamy peanut butter
- 2 large eggs
- 1 tsp vanilla extract
- 1 ½ cups old-fashioned oats
- 1 cup all-purpose flour
- 1 tsp baking soda
- ¼ tsp salt
- ½ cup mini chocolate chips
- ¾ cup M&M candies (plus extra for topping)
Instructions
- Preheat the oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper or lightly grease it.
- In a large mixing bowl, whisk melted butter, brown sugar, and peanut butter until smooth.
- Add eggs and vanilla extract, and mix until well combined.
- Stir in oats, flour, baking soda, and salt until a thick dough forms.
- Fold in chocolate chips and M&Ms.
- Spread the mixture evenly into the prepared baking pan and press down gently.
- Sprinkle extra M&Ms on top for color.
- Bake for 20–25 minutes, or until golden brown and slightly set in the center.
- Cool completely before cutting into bars.
Notes
- Don’t overbake — they’ll firm up as they cool.
- Use creamy or chunky peanut butter depending on texture preference.
- Substitute mini M&Ms for extra color and fun.
- Store in an airtight container for up to 5 days.
- These bars freeze beautifully for up to 2 months.
Tips for Monster Cookie Bars:
- For thicker bars, bake in a smaller 9×9-inch pan.
- Add chopped nuts for extra crunch.
- Drizzle melted chocolate over cooled bars for added richness.
- Mix up the candies — try peanut butter chips or Reese’s Pieces.
- Line the pan with parchment for easy removal and clean slicing.
FAQs for Monster Cookie Bars:
Q: Can I use quick oats instead of old-fashioned oats?
Yes, but the bars will have a slightly softer texture.*
Q: Can I make these bars without peanut butter?
Substitute with almond or sunflower seed butter for a nut-free option.*
Q: How do I know when they’re done baking?
The edges should be lightly golden, and the center should look just set.*
Q: Can I double the recipe?
Absolutely! Bake in a large sheet pan and adjust the time slightly.*
Q: What’s the best way to store them?
Keep them in an airtight container at room temperature for freshness.*
Conclusion:
Monster Cookie Bars are the ultimate chewy, colorful dessert for cookie lovers. Packed with oats, peanut butter, chocolate, and M&Ms, they’re easy to make, fun to eat, and perfect for sharing. Whether you’re baking for a party or just craving something sweet, these bars are guaranteed to satisfy every sweet tooth.