Monster Cookie Bars: The Ultimate Monster Cookie Bars Recipe
Introduction to Monster Cookie Bars
Monster Cookie Bars are a delightful and indulgent treat that combines the best of cookies and bars into one easy-to-make dessert. These bars are packed with flavor and texture, featuring creamy peanut butter, chocolate chips, and colorful M&M’s that make them irresistible. Perfect for a snack or a dessert at gatherings, these bars are sure to satisfy your sweet tooth and leave you craving more!
A Personal Story Behind My Monster Cookie Bars Journey
Growing up, my family often gathered in the kitchen to bake together. One of our favorite recipes was a version of cookie bars that my grandmother made, and they quickly became a staple in our household. With the combination of peanut butter and chocolate, these Monster Cookie Bars remind me of those cherished moments, bringing back the warmth and joy of baking with loved ones. Every time I make them, it feels like I’m continuing a delicious tradition!
What Makes This Monster Cookie Bars Recipe Special?
What sets this Monster Cookie Bars recipe apart is the incredible combination of flavors and textures. The chewy oats provide a hearty base, while the creamy peanut butter adds richness. The semisweet chocolate chips bring a touch of sweetness, and the M&M’s add a fun crunch and pop of color. Plus, they are easy to make and perfect for sharing with family and friends. These bars are not only satisfying but also visually appealing, making them an excellent choice for any occasion!
The Full Monster Cookie Bars Recipe
Ingredients
- 1 ½ cups (180 g) all-purpose flour
- 1 ½ cups (127 g) old fashioned oats
- 1 teaspoon baking soda
- ½ teaspoon salt
- ½ cup (113 g) unsalted butter, at room temperature
- ½ cup (113 g) no-stir creamy peanut butter
- ¾ cup (150 g) packed light brown sugar
- ½ cup (100 g) granulated sugar
- 1 egg, at room temperature
- 1 egg yolk, at room temperature
- 2 teaspoons pure vanilla extract
- 1 cup (170 g) semisweet chocolate chips
- 1 cup M&M’s chocolate candies, plus more for sprinkling on top
Instructions
- Preheat the oven to 350°F (175°C). Line a 9×13 baking pan with parchment paper and set it aside for easy removal later.
- In a medium bowl, whisk together the flour, oats, baking soda, and salt. This will ensure even distribution of the dry ingredients.
- Using a stand mixer or hand mixer, beat the butter, brown sugar, and granulated sugar on medium-high speed until light in color and fluffy, about 3 minutes. This step is crucial for incorporating air into the mixture.
- Add the peanut butter, egg, egg yolk, and vanilla extract to the mixing bowl. Mix until well combined, scraping down the sides as needed.
- Gradually add the flour mixture to the wet ingredients and mix just until combined. Be careful not to overmix, as this can make the bars tough.
- Fold in the chocolate chips and M&M’s by hand, ensuring they are evenly distributed throughout the dough.
- Transfer the dough to the prepared baking dish and press it down evenly using a spatula or your hands. Sprinkle some extra M&M’s on top and press them down slightly for a decorative touch.
- Bake in the preheated oven for 25 to 30 minutes or until the edges are set and the center is soft. Keep an eye on them to prevent overbaking; you want a soft center!
- Let the bars cool in the pan for 10 minutes before lifting them out and allowing them to cool completely on a wire rack. Once cool, slice and serve!
Serving Suggestions and Variations for Monster Cookie Bars
These Monster Cookie Bars are delicious on their own, but you can elevate them even further! Serve them warm with a scoop of vanilla ice cream for a decadent dessert. Drizzle with chocolate or caramel sauce for added sweetness. For a twist, try adding chopped nuts or dried fruit to the dough for extra texture and flavor. You can also experiment with different types of candy or chocolate chips to customize the bars to your liking!
Frequently Asked Questions About Monster Cookie Bars
Can I make these bars ahead of time?
Yes, you can prepare the bars ahead of time. Store them in an airtight container at room temperature for up to a week.
Can I freeze Monster Cookie Bars?
Absolutely! These bars freeze well. Just wrap them tightly in plastic wrap or place them in an airtight container, and they can be stored in the freezer for up to three months.
What’s the best way to cut the bars?
To achieve clean cuts, allow the bars to cool completely. Use a sharp knife and cut them in straight lines to prevent crumbling.
Can I use a different type of nut butter?
Yes, you can substitute peanut butter with almond butter or any other nut butter you prefer. Just keep in mind that it may alter the flavor slightly.
Do I have to add M&M’s?
No, you can omit the M&M’s or replace them with your favorite candy or chocolate chips. The bars will still be delicious!

Monster Cookie Bars
Equipment
- Oven Preheat to 350°F
- 9"x13" baking pan Line with parchment paper
Ingredients
Main Ingredients
- 1.5 cups all-purpose flour
- 1.5 cups old fashioned oats
- 1 teaspoon baking soda
- 0.5 teaspoon salt
- 0.5 cups unsalted butter, at room temperature
- 0.5 cups no-stir creamy peanut butter
- 0.75 cups packed light brown sugar
- 0.5 cups granulated sugar
- 1 unit egg, at room temperature
- 1 unit egg yolk, at room temperature
- 2 teaspoons pure vanilla extract
- 1 cups semisweet chocolate chips
- 1 cups M&M’s chocolate candies
Instructions
- Preheat the oven to 350°F (175°C). Line a 9x13 baking pan with parchment paper and set it aside for easy removal later.
- In a medium bowl, whisk together the flour, oats, baking soda, and salt. This will ensure even distribution of the dry ingredients.
- Using a stand mixer or hand mixer, beat the butter, brown sugar, and granulated sugar on medium-high speed until light in color and fluffy, about 3 minutes.
- Add the peanut butter, egg, egg yolk, and vanilla extract to the mixing bowl. Mix until well combined.
- Gradually add the flour mixture to the wet ingredients and mix just until combined.
- Fold in the chocolate chips and M&M's by hand, ensuring they are evenly distributed throughout the dough.
- Transfer the dough to the prepared baking dish and press it down evenly using a spatula.
- Bake in the preheated oven for 25 to 30 minutes or until the edges are set and the center is soft.
- Let the bars cool in the pan for 10 minutes before lifting them out and allowing them to cool completely.