Monster Cookie Fudgy Brownies

Oh, you know those days when you just *need* something extra special? Something that hits all the right notes—chewy, fudgy, and packed with all your favorite candy? That’s exactly how these Monster Cookie Fudgy Brownies came to be in my kitchen. I was craving a brownie, but also a cookie, and I figured, why not both? The result was pure magic, and now they’re a go-to whenever I want to impress or just treat myself to the ultimate dessert. They’re seriously addictive!

Why You’ll Love This Monster Cookie Fudgy Brownies

• These brownies are incredibly fudgy, with that perfect dense, chewy texture.
• You get the best of both worlds: rich chocolate brownie and a soft monster cookie.
• They’re surprisingly easy to make, even though they look super impressive.
• Perfect for parties, potlucks, or just a cozy night in with a sweet craving.

Ingredients You’ll Need

• Unsweetened cocoa powder dutch process: This gives your brownies a darker color and a milder, less bitter chocolate flavor than natural cocoa powder. You really want to use Dutch process for that classic fudgy brownie taste.
• Cornstarch: A little secret ingredient in both the brownies and the cookies! It helps create that super fudgy brownie texture and keeps the cookies soft. Don’t skip it!
• Canola or vegetable oil: Using oil alongside butter gives the brownies an amazing fudgy texture that butter alone can’t quite achieve.
• Brown sugar: This adds moisture and a lovely caramel note to the cookie dough, making it extra chewy. Light or dark works great!
• Quick oats: Essential for that classic monster cookie texture. They add a nice chewiness without making the cookies too dense.

How to Make Monster Cookie Fudgy Brownies Step by Step

First things first, we’re going to get that monster cookie dough ready. In a medium bowl, whisk together your dry ingredients for the cookies: flour, cornstarch, baking soda, baking powder, and salt. Set that aside for a moment. Now, grab your mixer and beat together the room temperature butter, brown sugar, and white sugar for a minute until it’s light and fluffy. This is where the magic starts to happen! Then, add in the peanut butter and mix for another minute. You want it all nice and combined.

Next, add the vanilla and egg to your peanut butter mixture and beat until everything is just combined. Don’t forget to scrape down the sides of the bowl to make sure everything gets incorporated. Now, slowly add your dry cookie ingredients to the wet ones. Mix just until combined, then stir in the oats, mini M&M’s, and mini chocolate chips. Cover this beautiful dough and pop it in the fridge to chill for about 40 minutes. This chilling time is important for the cookie dough to firm up and for the flavors to meld.

While your cookie dough is chilling, it’s time to start on those fudgy brownies. Preheat your oven to 325°F (160°C) and prepare a 9×9 inch pan by spraying it with non-stick spray and lining the bottom and two sides with parchment paper. This will make removing the brownies so much easier later! In another bowl, whisk together your brownie dry ingredients: flour, cocoa powder, cornstarch, and salt. Set that aside. Now, in your mixer, combine the sugar, eggs, and egg yolk and beat them on high for a full 5 minutes until they’re very light and fluffy. While they’re beating, quickly melt your butter so it has a chance to cool down a bit.

Once your egg mixture is light and airy, add in the slightly cooled melted butter, oil, and vanilla. Mix on low just until combined. Take the bowl off the mixer and gently fold in your dry brownie ingredients with a rubber spatula. Remember to be gentle here; we don’t want to lose all that lovely air we just whipped into the eggs! Finally, fold in the semi-sweet and milk chocolate chips. Pour this decadent batter into your prepared pan and smooth it out into the corners. Bake for 15 minutes to let the top set slightly. While it’s baking, grab your chilled cookie dough and flatten small handfuls into disc shapes. Once the brownies have baked for 15 minutes, arrange these cookie dough discs on top. Bake for another 20 minutes, then loosely tent with foil to prevent the cookie tops from getting too dark. Continue baking for another 5-10 minutes, or until there’s no jiggle and the brownies and cookies are set. Let them cool completely on a wire rack before slicing – trust me, it’s worth the wait!

My Top Tips for Success

• I always make sure my eggs for the cookie dough are at room temperature. It helps them incorporate better and creates a smoother dough.
• Don’t overmix the brownie batter once you add the dry ingredients. Gently fold them in to keep the brownies tender and fudgy.
• Trust me on this one: chilling the cookie dough is non-negotiable. It helps prevent the cookies from spreading too much and allows the flavors to deepen.
• Lining your pan with parchment paper, leaving an overhang on two sides, is a game-changer for easy removal. You can just lift the entire slab out!
• Resist the urge to cut into them warm. Seriously. Letting them cool completely ensures clean cuts and the best fudgy texture.

Common Mistakes to Avoid

• Overmixing the brownie batter: This can lead to tough, cake-like brownies instead of fudgy ones. Mix only until the dry ingredients are just incorporated.
• Not chilling the cookie dough: If you skip chilling, your cookie dough might spread too much and melt into the brownie layer.
• Cutting warm brownies: This is a common mistake! Warm brownies are messy and crumbly. Always wait until they are completely cool for perfect squares.
• Overbaking: Overbaked brownies are dry. Watch for the lack of jiggle in the center, and remember they will continue to cook slightly as they cool.

How to Store Monster Cookie Fudgy Brownies

• Room Temperature: Store in an airtight container at room temperature for up to 3-4 days.
• Freezer: For longer storage, wrap individual brownies tightly in plastic wrap, then place them in a freezer-safe bag or container. Freeze for up to 2-3 months. Thaw at room temperature before enjoying.

Frequently Asked Questions

Can I use natural cocoa powder instead of Dutch process?

While you can, Dutch process cocoa powder gives these brownies their signature dark color and rich, deep chocolate flavor. Natural cocoa powder will work, but the brownies might be lighter in color and slightly less fudgy.

Do I have to use quick oats, or can I use old-fashioned oats?

Quick oats are recommended for their finer texture, which blends seamlessly into the cookie dough without making it too chewy or crumbly. Old-fashioned oats will work in a pinch, but the texture will be a bit different.

Can I make these ahead of time?

Absolutely! These brownies are wonderful for making ahead. They actually taste even better the next day once the flavors have had a chance to meld.

What if I don’t have a 9×9 inch pan?

You can use an 8×8 inch pan, but you might need to increase the baking time slightly, and the brownies will be thicker. Keep an eye on them during the last baking stage.

I hope these Monster Cookie Fudgy Brownies bring as much joy and deliciousness to your kitchen as they do to mine. They’re truly a showstopper and so much fun to make! If you bake them, I’d absolutely love to hear how they turned out and what you thought.

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