There’s a certain kind of magic that happens when two beloved desserts collide, and this recipe for Monster Cookie Fudgy Brownies is the perfect example. Imagine sinking your teeth into a rich, fudgy brownie layered with a colorful, chewy monster cookie dough, creating a delightful interplay of textures and flavors. Not only does this dessert satisfy your chocolate cravings, but it also adds a whimsical twist with its playful mix of oats, peanut butter, and candy-coated M&M’s. Perfect for gatherings or simply a cozy night in, these brownies are a family-friendly treat that will leave everyone wanting more. Who can resist a dessert that marries brownie and cookie goodness into one delicious bite? Are you ready to create a sweet masterpiece?

Why Are These Brownies So Irresistible?

Irresistible Layers: Each bite features a rich, fudgy brownie base topped with a chewy monster cookie layer, creating a delightful combination of textures.
Nostalgic Flavors: With the classic mix of oats, peanut butter, and colorful M&M’s, these brownies bring back fond memories of childhood treats!
Family-Friendly Fun: Perfect for gatherings or a cozy family night, these brownies are a hit among both kids and adults alike.
Quick and Easy: In just a few simple steps, you can whip up this delectable dessert—a perfect solution for those who crave homemade goodness without the fuss.
Versatile Options: Feel free to customize your brownies—try swapping peanut butter with cookie butter or adding extra chocolate chips for that extra chocolaty goodness! Once you’ve made these, you might also want to check out my Patriotic Thumbprint Cookies for more sweet inspiration.

Monster Cookie Fudgy Brownies Ingredients

For the Brownie Batter

  • Granulated Sugar – Adds sweetness and moisture to the brownies; can be reduced for a less sweet dessert.
  • Eggs (2 large + 1 yolk) – Provides structure and richness; ensure they are at room temperature for best results.
  • Unsalted Butter (5 tbsp + ¼ cup) – Contributes to the fudgy texture and flavor; melt and let cool before mixing.
  • Canola or Vegetable Oil (⅓ cup) – Adds moisture and helps achieve a chewy texture; substitute with melted coconut oil for a different flavor.
  • Vanilla Extract (1 tsp) – Enhances overall flavor.
  • All-Purpose Flour (½ cup) – Provides structure; spoon and level to avoid excess flour that can dry the brownies.
  • Cocoa Powder (¾ cup, Dutch process) – For a rich chocolate flavor.
  • Cornstarch (1 tbsp + 1 tsp) – Stabilizes the batter.
  • Salt (¼ tsp) – Balances sweetness and enhances flavor.
  • Semi-Sweet & Milk Chocolate Chips (½ cup each) – Adds delicious pockets of chocolate.

For the Monster Cookie Layer

  • All-Purpose Flour (½ cup) – Provides the base structure for the cookie dough; a must for that chewy texture.
  • Quick Oats (½ cup) – Offers chewiness and complements the cookie dough layer beautifully.
  • Peanut Butter (¼ cup) – Adds flavor and creaminess; can be swapped with sunflower seed butter for a nut-free version.
  • Mini M&M’s (½ cup) – Adds fun color and extra sweetness to the cookie layer.
  • Mini Chocolate Chips (½ cup) – Infuses more chocolatey goodness into the cookie dough.

Embrace the joy of baking with these Monster Cookie Fudgy Brownies, where every ingredient plays an important role in creating that delightful dessert experience!

Step‑by‑Step Instructions for Monster Cookie Fudgy Brownies

Step 1: Prepare the Monster Cookie Dough
In a large mixing bowl, combine ½ cup all-purpose flour, 1 tablespoon cornstarch, ¼ teaspoon baking soda, ¼ teaspoon baking powder, and ¼ teaspoon salt. In another bowl, beat together ¼ cup unsalted butter and ½ cup each of brown sugar and granulated sugar until fluffy and light. Mix in ¼ cup peanut butter, then add 1 teaspoon vanilla extract and 1 large egg, beating until fully combined. Gradually add the dry mixture, followed by ½ cup quick oats, ½ cup mini M&M’s, and ½ cup mini chocolate chips. Chill the dough in the fridge for 40 minutes.

Step 2: Make the Brownie Batter
Preheat your oven to 325°F (163°C). Grease a 9×9-inch baking pan and line it with parchment paper, leaving overhang on two sides for easy removal. In a separate bowl, sift together ½ cup all-purpose flour, ¾ cup Dutch-process cocoa powder, 1 tablespoon cornstarch, and ¼ teaspoon salt. In a mixer, combine 1 cup sugar and 2 large eggs with 1 egg yolk, beating until the mixture is light and fluffy, approximately 3-4 minutes. Add ¼ cup melted unsalted butter, ⅓ cup canola oil, and 1 teaspoon vanilla, mixing until smooth. Gently fold in the dry ingredients, followed by ½ cup each of semi-sweet and milk chocolate chips.

Step 3: Layer and Bake
Spread the brownie batter evenly into the prepared pan, smoothing the top. Bake in the oven for 15 minutes to create a firm base. While the brownies are baking, flatten your chilled cookie dough into thin discs. After 15 minutes, remove the pan from the oven and layer the cookie dough discs over the partially baked brownies. Return to the oven and bake for an additional 20-30 minutes until the top is golden brown and set. Check for doneness by inserting a toothpick—it should come out slightly moist but not wet.

Step 4: Cool and Slice
Once baked, remove the Monster Cookie Fudgy Brownies from the oven and allow them to cool completely in the pan on a wire rack. Patience is key here! Cooling helps the brownies firm up for clean slicing. Once cooled, use the parchment overhang to lift the brownies out of the pan and place onto a cutting board. Slice into 16 squares for perfectly portioned indulgence.

Expert Tips for Monster Cookie Fudgy Brownies

  • Cool Completely: Allow brownies to cool to room temperature before slicing. This ensures clean edges and a better texture for your Monster Cookie Fudgy Brownies.
  • Room Temperature Eggs: Using eggs at room temperature helps them incorporate better into the batter, giving you a richer and fluffier end result.
  • Chill the Cookie Dough: Don’t skip chilling the monster cookie dough for 40 minutes—it prevents spreading and helps maintain that chewy texture when baked.
  • Watch Baking Time: Ovens can vary. Start checking the brownies at 20 minutes for doneness. A toothpick should come out with a few moist crumbs, but not wet batter.
  • Layer Evenly: When layering the cookie dough over the brownie batter, spread it out into an even layer for uniform baking and texture throughout your Monster Cookie Fudgy Brownies.
  • Personalize Flavors: Feel free to mix up the chocolate chips or add nuts. This gives you a chance to tailor the brownies to your family’s tastes!

Monster Cookie Fudgy Brownies Variations

Feel free to get creative with this recipe and make it your own in delightful ways!

  • Nut-Free: Replace peanut butter with sunflower seed butter for a delicious, allergy-friendly option. Feel free to add some chopped seeds for crunch!
  • Gluten-Free: Substitute all-purpose flour for a gluten-free blend, ensuring your brownies can be enjoyed by those with dietary restrictions.
  • Extra Chocolatey: Boost the chocolate factor by incorporating dark chocolate chips or a swirl of chocolate ganache on top before serving. Pure bliss in every bite!
  • Candy Swap: Use white chocolate chips or butterscotch chips instead of semi-sweet chocolate chips for a different flavor twist. The colors of the candies also add extra fun!
  • Fruity Flavor: Mix in dried fruits like cranberries or cherries for a tart contrast that pairs beautifully with the rich chocolate.
  • Minty Fresh: Add a few drops of peppermint extract to the brownie batter for a refreshing mint flavor. This adds a festive twist, especially around the holidays!
  • Bigger Batches: Feel free to double the recipe and use a larger pan (like 9×13). You’ll have plenty of these tasty treats to share with friends and family!
  • Ultimate Sundae: Serve your brownies warm with a scoop of vanilla ice cream and a drizzle of caramel sauce for a decadent dessert that’ll impress everyone.

Once you’ve enjoyed the joys of baking these Monster Cookie Fudgy Brownies, why not explore some delicious alternatives like my Chocolate Lava Brownie Cookies or try out a batch of Chocolate Chip Cookies for more sweet fun? Happy baking!

Make Ahead Options

These Monster Cookie Fudgy Brownies are perfect for busy home cooks looking to save time during the week! You can prepare the brownie batter and monster cookie dough up to 24 hours in advance. Simply store the brownie batter in an airtight container in the fridge and chill the cookie dough separately. When you’re ready to bake, layer the chilled brownie batter into the prepared pan, followed by the flattened cookie dough. Bake as directed, and you’ll have a batch of rich and fudgy brownies with a delightful cookie topping just as delicious as if made fresh that day! Enjoy the convenience of meal prep while treating your family to a homemade dessert!

What to Serve with Monster Cookie Fudgy Brownies

Elevate your dessert experience with delightful pairings that complement the rich, gooey nature of your brownies.

  • Vanilla Ice Cream: The creamy, cold scoop balances the warm fudginess of the brownies, creating a dreamy contrast.

  • Chocolate Drizzle: A simple swirl of warm melted chocolate enhances the decadence of each brownie bite, appealing to any chocolate lover.

  • Fresh Berries: Juicy raspberries or strawberries add a refreshing tartness that cuts through the sweetness, providing a lovely pop of color and flavor.

  • Caramel Sauce: Drizzling homemade or store-bought caramel over your brownies introduces a buttery sweetness that keeps you coming back for more.

  • Coffee or Espresso: A rich, hot cup of coffee will enhance the chocolatey flavors and bring a comforting warmth, perfect for any time of day.

  • Mint Chocolate Chip Milkshake: This fun shake combines minty freshness with chocolate, resonating with the cookie dough, which makes for a playful pairing.

  • Whipped Cream: Add a dollop of fluffy whipped cream on top for added lightness, creating a beautiful and airy finish.

  • Nutty Trail Mix: For a crunchy contrast, serve a small bowl of nutty trail mix on the side. The textures complement the fudgy brownies perfectly.

  • Sparkling Water: Refresh your palate with a crisp, bubbly sparkling water; it cleanses the tastebuds between indulgent bites.

How to Store and Freeze Monster Cookie Fudgy Brownies

  • Room Temperature: Keep your Monster Cookie Fudgy Brownies in an airtight container at room temperature for up to 5 days to maintain their delightful texture and taste.
  • Fridge: For longer storage, place the brownies in an airtight container in the fridge, where they can last for up to 7 days, but expect slight texture changes.
  • Freezer: To freeze, wrap individual brownies tightly in plastic wrap and then place them in a freezer-safe bag. They can be stored for up to 3 months without losing flavor.
  • Reheating: To enjoy frozen brownies, thaw them in the fridge overnight and reheat in the microwave for 10-15 seconds for a warm, fudgy treat!

Monster Cookie Fudgy Brownies Recipe FAQs

What is the best way to select ripe ingredients for the brownies?
Absolutely! For the best flavor and texture, make sure your eggs are fresh and at room temperature. When choosing chocolate chips, opt for high-quality semi-sweet and milk chocolate brands for a rich experience. For oats, quick oats work best for the chewiest texture in your cookie layer, giving it that classic monster cookie feel!

How should I store Monster Cookie Fudgy Brownies?
To keep your delicious brownies fresh, store them in an airtight container at room temperature for up to 5 days. For longer shelf life, transferring them to the refrigerator allows them to last up to a week, though the texture might become slightly firmer. Just be sure to let them come to room temperature for the best flavor when serving!

Can I freeze Monster Cookie Fudgy Brownies?
Absolutely! To freeze, wrap each brownie individually in plastic wrap, then place them in a freezer-safe bag—this way, they can stay delicious for up to 3 months. When you’re ready to enjoy, thaw them in the fridge overnight, and if you’d like a warm, fudgy treat, pop them in the microwave for 10-15 seconds!

What if my brownies turn out too gooey or undercooked?
If you find your brownies are too gooey, it might be because they were removed from the oven too early. Always check for doneness by inserting a toothpick; it should come out with a few moist crumbs, not wet batter. If they are undercooked, simply return them to the oven for a few additional minutes, keeping an eye on them to avoid overbaking.

Are these brownies safe for people with nut allergies?
Yes! You can easily adjust the recipe for nut allergies—just swap the peanut butter with sunflower seed butter or even cookie butter for a delicious nut-free alternative. This way, everyone can enjoy the rich, fudgy goodness of these Monster Cookie Fudgy Brownies!

Can I use other mix-ins for the cookie layer?
Very! Feel free to customize your brownies by experimenting with your favorite mix-ins—like different types of chocolate chips or adding nuts for an extra crunch. This recipe is versatile, so let your creativity shine!

Monster Cookie Fudgy Brownies

Monster Cookie Fudgy Brownies That'll Make You Smile

This Monster Cookie Fudgy Brownies recipe combines chocolatey brownies with a colorful cookie layer, perfect for satisfying your sweet tooth.
Prep Time 40 minutes
Cook Time 35 minutes
Cooling Time 30 minutes
Total Time 1 hour 45 minutes
Servings: 16 squares
Course: Bars & Brownies
Cuisine: American
Calories: 200

Ingredients
  

For the Brownie Batter
  • 1 cup Granulated Sugar
  • 2 large Eggs plus 1 yolk
  • 5 tbsp Unsalted Butter melted and cooled
  • cup Canola or Vegetable Oil can substitute with melted coconut oil
  • 1 tsp Vanilla Extract
  • ½ cup All-Purpose Flour
  • ¾ cup Cocoa Powder Dutch process
  • 1 tbsp Cornstarch
  • ¼ tsp Salt
  • ½ cup Semi-Sweet Chocolate Chips
  • ½ cup Milk Chocolate Chips
For the Monster Cookie Layer
  • ½ cup All-Purpose Flour
  • ½ cup Quick Oats
  • ¼ cup Peanut Butter can swap with sunflower seed butter
  • ½ cup Mini M&M's
  • ½ cup Mini Chocolate Chips

Equipment

  • mixing bowls
  • 9×9-inch Baking Pan
  • Parchment Paper
  • Mixer

Method
 

Step-by-Step Instructions
  1. Prepare the Monster Cookie Dough by combining flour, cornstarch, baking soda, baking powder, and salt in one bowl. In another bowl, beat butter and sugars until fluffy, then mix in peanut butter, vanilla, and eggs. Gradually add dry mixture, oats, M&M's, and chocolate chips. Chill for 40 minutes.
  2. Make the Brownie Batter by preheating the oven to 325°F (163°C). Grease and line a 9x9-inch baking pan. Sift together flour, cocoa powder, cornstarch, and salt in a bowl. Beat together sugar and eggs until light and fluffy, then mix in melted butter, oil, and vanilla. Fold in dry ingredients and chocolate chips.
  3. Layer and Bake by spreading brownie batter in the pan and baking for 15 minutes. Flatten chilled cookie dough and layer over brownies. Bake for an additional 20-30 minutes until set and golden brown.
  4. Cool and Slice by allowing brownies to cool completely in the pan before slicing into 16 squares.

Nutrition

Serving: 1squareCalories: 200kcalCarbohydrates: 30gProtein: 3gFat: 10gSaturated Fat: 5gPolyunsaturated Fat: 2gMonounsaturated Fat: 3gCholesterol: 30mgSodium: 50mgPotassium: 150mgFiber: 1gSugar: 15gVitamin A: 200IUCalcium: 20mgIron: 1mg

Notes

Ensure eggs are at room temperature for better incorporation. Chill cookie dough to prevent spreading and maintain chewiness during baking.

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