Easy Monster Cookie Fudgy Brownies – Double Layer Brookies! 1 Hour Prep Time.

Easy Monster Cookie Fudgy Brownies: The Ultimate Double-Layer Brookie

These monster cookie fudgy brownies are a double layer brownies. It has a super fudgy brownie layer loaded with chocolate chips. Then, monster cookie dough baked on top to create the ultimate brownie! If you want to up your next batch of brownies, you have to try these! Monster cookies are the type of cookie that has all the fix-ins. They are my favorite type of cookie! These cookies are a cross between an oatmeal chocolate chip cookie and a peanut butter cookie. It is best of both worlds! This cookie has oats, peanut butter, mini M&M’s and mini chocolate chips. Now imagine all of that incredible texture and flavor baked on top of the richest, fudgiest brownie base. It’s a dessert lover’s dream come true. For another incredible brownie recipe, try our Espresso Brownies.

Why You’ll Love This Monster Cookie Brownie Recipe

• The Ultimate Dessert Mashup: All the best parts of a fudgy brownie and a chewy monster cookie in one perfect bar.
• Incredible Texture: Rich, dense, fudgy brownie base contrasts beautifully with the chunky, chewy cookie topping.
• Loaded with Goodies: Chocolate chips, peanut butter, oats, and colorful M&M’s in every bite.
• Perfect for Sharing: A showstopping dessert that’s guaranteed to impress at parties and potlucks.
• Deep, Rich Chocolate Flavor: The fudgy brownie layer is based on a tried-and-true recipe for the best chocolate flavor.

Your Simple Ingredients for the Perfect Monster Cookie Fudgy Brownies

For the Fudgy Brownie Layer:

• 1⅓ cup White granulated sugar
• 2 Large eggs
• 1 Egg yolk
• 5 TBSP Unsalted butter
• ⅓ cup Oil, canola or vegetable
• 1 tsp Pure vanilla extract
• ½ cup All-purpose flour
• ¾ cup Unsweetened 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 Dough Layer:

• ½ cup All-purpose flour
• 1 tsp Cornstarch
• ½ tsp Baking soda
• ⅛ tsp Baking powder
• ¼ tsp Salt
• ¼ cup Unsalted butter, room temperature
• ⅓ cup Brown sugar, packed (light or dark)
• ⅛ cup White granulated sugar
• ¼ cup Peanut butter, creamy
• 1 tsp Pure vanilla extract
• 1 Large egg, room temperature
• ½ cup Quick oats
• ½ cup Mini chocolate chips
• ½ cup Mini M&M’s

Pro Tip: The Secret to a Fudgy, Not Cakey, Brownie
The key to that dense, fudgy texture is beating the eggs and sugar for a full 5 minutes until they are very light and fluffy. This incorporates air, which is the only leavening agent in the brownies. Beating them properly ensures a beautiful, fudgy rise. Also, folding in the dry ingredients gently is crucial to not knock that precious air out.

How to Make Perfect Monster Cookie Fudgy Brownies

Phase 1: Make and Chill the Monster Cookie Dough

Mix Dry Ingredients: In a medium bowl, whisk together the flour, cornstarch, baking soda, baking powder, and salt. Set aside.
Cream Butter and Sugars: In a large mixer bowl, beat the butter, brown sugar, and white sugar together for about 1 minute on medium speed until light and fluffy. Add the peanut butter and beat for another minute.
Add Wet Ingredients: Add the vanilla and the egg. Mix until combined. Scrape down the bowl and mix again for 20 seconds.
Combine: Slowly add the dry ingredients to the wet ingredients and mix until just combined. Then, stir in the oats, mini M&M’s, and mini chocolate chips.
Chill: Cover the dough and refrigerate for 40 minutes. This step is essential to firm up the dough so it’s easier to handle later.

Phase 2: Prepare the Brownie Batter and Pan

Preheat and Prep Pan: When the cookie dough is almost done chilling, preheat your oven to 325°F (165°C) . Spray a 9×9-inch baking pan with non-stick spray and line the bottom and two sides with parchment paper, leaving an overhang. This will make it easy to lift the brownies out later.
Whisk Dry Ingredients: In a medium bowl, whisk together the flour, cocoa powder, cornstarch, and salt. Set aside.
Beat Eggs and Sugar: Using a mixer with a whisk attachment, combine the sugar, eggs, and egg yolk. Beat on medium-high speed for 5 minutes until the mixture is very light, thick, and fluffy. While this beats, melt the butter so it can cool slightly.
Add Butter, Oil, and Vanilla: With the mixer on low, add the melted butter, oil, and vanilla. Mix just until combined.
Fold in Dry Ingredients: Take the bowl off the mixer. Add all of the dry ingredients and use a rubber spatula to gently fold them in until just combined. Be careful not to deflate the batter.
Add Chocolate Chips: Gently fold in the semi-sweet and milk chocolate chips.

Phase 3: Assemble and Bake

First Brownie Bake: Pour the brownie batter into the prepared pan and smooth it into an even layer. Bake for 15 minutes. This par-bakes the brownie layer so it can support the cookie dough.
Add Cookie Dough: Remove the pan from the oven. Take small handfuls of the chilled monster cookie dough and flatten each into a disc shape. Arrange the discs over the partially baked brownie layer, covering the top. Continue until all the dough is used. It’s okay if they touch; they will spread together as they bake.
Final Bake: Return the pan to the oven and bake for another 20 minutes. If the top is browning too quickly, loosely cover with foil. Bake for a final 5-10 minutes until the cookie topping is set and there’s no jiggle in the center.

Phase 4: Cool, Slice, and Serve

Cool Completely: Place the pan on a wire rack and let the brownies cool completely. This is crucial! The chocolate flavor will be much richer at room temperature, and they will be set enough to cut cleanly. To speed up the process, you can pop the pan in the freezer for 25 minutes once it’s no longer hot.
Slice: Once completely cool, use the parchment overhang to lift the whole slab out of the pan. Place on a cutting board. Use a sharp knife to cut into 16 squares, wiping the knife clean between each cut for perfect edges.
Serve: Store at room temperature in an airtight container and enjoy the ultimate cookie-brownie experience!

Pro Tips & Easy Variations for Your Brookies

• Don’t Skip the Chill: Chilling the monster cookie dough is essential. It makes it much easier to handle and prevents it from spreading too much and merging completely with the brownie layer.
• Patience with Cooling: I know it’s hard, but letting these cool completely is non-negotiable for the best flavor and texture. Warm brownies taste dull; room temperature brownies have a much stronger, richer chocolate flavor.
• Add Extra Toppings: For even more color and crunch, sprinkle extra mini M&M’s and chocolate chips on top of the cookie dough layer just before the final bake.
• High Altitude Baking: For high altitude, add an extra ½ tablespoon of flour to both the brownie and cookie dough mixtures.
• Nut Butter Substitute: If you have a peanut allergy, you can substitute the peanut butter with cookie butter or sunbutter.
• 9×13 Pan: To bake this in a 9×13-inch pan, simply double the entire recipe.

Serving Suggestions for the Ultimate Dessert

These monster cookie fudgy brownies are a complete indulgence on their own. Serve them with a tall glass of cold milk for the ultimate pairing. They’re also incredible slightly warmed with a scoop of vanilla ice cream. They’re perfect for birthday parties, bake sales, or any time you want to wow a crowd.

Nutrition Information

(Approximate per brownie, based on 16) Calories: 325, Fat: 18g, Carbohydrates: 41g, Protein: 4g, Sugar: 29g, Fiber: 3g. A rich, decadent, special-occasion dessert.

Storage & Make-Ahead Instructions

• Store at Room Temperature: Keep these brownies in an airtight container at room temperature for up to 5 days. The flavor actually deepens over a day or two.
• Freeze: These brownies freeze beautifully. Wrap them individually in plastic wrap, then place in a freezer-safe bag or container for up to 3 months. Thaw at room temperature.

Your Monster Cookie Fudgy Brownies Questions Answered

1. Can I use an 8×8 pan instead of 9×9?
   • Yes, you can! The brownies will just be a little thicker. The baking time may increase slightly, so keep an eye on them and check for doneness with a toothpick.
2. My cookie dough is too sticky to handle after chilling. What should I do?
   • If it’s still very sticky, pop it back in the freezer for another 10-15 minutes. You can also lightly flour your hands to make shaping the discs easier.
3. Can I use regular-sized M&M’s and chocolate chips?
   • You can, but the mini versions are recommended because they distribute more evenly throughout the cookie layer and prevent it from being too chunky.
4. Why are my brownies cakey instead of fudgy?
   • Cakey brownies are usually the result of overmixing the batter after adding the flour, or overbaking. Be sure to fold gently, and pull them out when they are just set.
5. Can I make these gluten-free?
   • You can try using a 1:1 gluten-free baking flour blend in both the brownie and cookie dough. Also, ensure your oats are certified gluten-free.

More Incredible Brownie and Dessert Bar Recipes to Try

If you love these over-the-top brownies, you’ll adore our other decadent dessert bar creations. Our Espresso Brownies are perfect for coffee lovers, and our S’mores Cookie Bars are another campfire-inspired favorite.

The Story Behind This Over-the-Top Dessert Mashup

Monster Cookie Fudgy Brownies are the ultimate expression of “more is more” in dessert form. They take two beloved treats – the rich, intense fudgy brownie and the chunky, chewy, everything-but-the-kitchen-sink monster cookie – and combine them into one spectacular layered bar. Every single bite is a perfect harmony of textures and flavors: dense, chocolatey fudge against a chewy, peanut butter-oatmeal cookie studded with colorful M&M’s and chocolate chips. It’s the kind of recipe that was made for sharing, for celebrating, and for satisfying even the most ambitious sweet tooth. This wonderfully creative and indulgent recipe is inspired by the version shared on Stephanie’s Sweet Treats by Stephanie Rut.

Pin This Ultimate Dessert For Your Next Sweet Celebration!

These monster cookie fudgy brownies will be the star of any dessert table. Save this image to your “Brownie Recipes” or “Dessert Bars” Pinterest board so you always have this showstopping recipe ready. Did you make these incredible, double-layer brownies? We’d love to see your creation – tag us in your photos!