Monster Cookie Fudgy Brownies

Every time I bake these Monster Cookie Fudgy Brownies, I’m instantly transported back to my childhood kitchen. There was always a little bit of magic happening when my mom pulled out the chocolate chips and peanut butter. These brownies are exactly that — pure magic! They combine everything wonderful about a chewy, peanut-butter-packed monster cookie with the rich, dense goodness of a fudgy brownie. Trust me, you’re going to love them!

Why You’ll Love This Monster Cookie Fudgy Brownies

• These aren’t your average brownies; they’re packed with peanut butter, oats, M&M’s, and chocolate chips for an explosion of flavor in every bite.
• The texture is out of this world! You get that perfect fudgy brownie base with a chewy, soft monster cookie layer on top.
• They look impressive but are surprisingly straightforward to make, perfect for any baker.
• They’re a total crowd-pleleaser, ideal for parties, potlucks, or just a cozy night in.

Ingredients You’ll Need

• Unsweetened cocoa powder dutch process: This is key for that deep, rich chocolate flavor and dark brownie color. Regular cocoa powder will work in a pinch, but Dutch process gives the best results.
• Cornstarch: A secret ingredient for extra fudginess in the brownies and chewiness in the cookies! Don’t skip it.
• Oil canola or vegetable: Adds moisture and keeps the brownies extra tender. Either canola or vegetable oil works perfectly.
• Brown sugar packed light or dark: The molasses in brown sugar adds moisture and a lovely caramel note to the cookie dough. Make sure to pack it down when measuring!
• Quick oats: These give the monster cookie dough its classic chewy texture. Instant oats are too fine, so stick with quick oats.
• Unsalted butter room temperature: For the cookie dough, room temperature butter creams beautifully with the sugars, creating that light and fluffy texture.

How to Make Monster Cookie Fudgy Brownies Step by Step

Let’s get started on these amazing Monster Cookie Fudgy Brownies! First, we’ll tackle the monster cookie dough. In a medium bowl, whisk together all your dry cookie ingredients – the flour, cornstarch, baking soda, baking powder, and salt. Set that aside for a moment. Now, grab your mixer and beat the room-temperature butter with both the brown and white sugars for about a minute until it’s light and fluffy. This is where the magic happens for that tender cookie texture!

Next, add in the creamy peanut butter and mix for another minute until it’s fully incorporated. Then, beat in the vanilla and the egg until everything is just combined. Scrape down the sides of your bowl to make sure everything is mixed evenly. Gradually add your dry cookie ingredients to the wet mixture, mixing until just combined. Fold in the quick oats, mini M&M’s, and mini chocolate chips. Cover this delicious dough and pop it in the fridge to chill for about 40 minutes – this helps prevent spreading. While it’s chilling, preheat your oven to 325°F (163°C) and prepare your 9×9 inch pan with non-stick spray and parchment paper. The parchment paper sling makes removal so much easier, trust me!

Now for the brownie batter! In a separate medium bowl, whisk together your brownie flour, cocoa powder, cornstarch, and salt. Set that aside. In a large bowl with your mixer, beat the sugar, eggs, and egg yolk for a full five minutes until the mixture is very light and fluffy. While that’s beating, melt your butter so it has a chance to cool slightly. Once the egg mixture is light, gently fold in the slightly cooled melted butter, oil, and vanilla on low speed. Take the bowl off the mixer and, using a rubber spatula, gently fold in the dry ingredients. Be super gentle here to keep all that lovely air in the eggs! Finally, fold in the semi-sweet and milk chocolate chips. Pour the batter into your prepared pan and smooth it out. Bake for 15 minutes to let that top set. Then, pull out your chilled cookie dough, flatten small handfuls into discs, and arrange them on top of the partially baked brownies. Bake for another 20 minutes, then loosely tent with foil and bake for an additional 5-10 minutes until set. No jiggle! Let them cool completely on a wire rack before cutting – this is crucial for clean slices.

My Top Tips for Success

• I always make sure my eggs for the brownie batter are at room temperature; it helps them whip up much fluffier.
• Trust me on this one: don’t overmix the brownie batter once you add the dry ingredients. Gentle folding keeps them fudgy and tender.
• Chilling the cookie dough is non-negotiable! It prevents the cookies from spreading too much during baking.
• Don’t skip the parchment paper sling in your pan. It makes lifting out the cooled brownies so much easier.
• I always let my brownies cool completely before cutting. Warm brownies are delicious, but fully cooled ones cut so much cleaner and are perfectly fudgy.
• Loosely tenting with foil during the last part of baking protects the cookie dough from over-browning while the brownies finish cooking.

Common Mistakes to Avoid

• Overmixing the brownie batter: Overmixing develops the gluten in the flour, leading to tough, cakey brownies instead of fudgy ones. Gently fold in the dry ingredients until just combined.
• Not chilling the cookie dough: If you don’t chill the cookie dough, it will spread too much when baked, resulting in thin, flat cookie layers. Chill for the full 40 minutes.
• Cutting warm brownies: Warm brownies are messy and crumbly. Always wait until they are completely at room temperature for clean, neat slices.
• Overbaking the brownies: Overbaked brownies lose their fudgy texture and become dry. Watch for the slight jiggle test – when it’s gone, they’re done.

How to Store Monster Cookie Fudgy Brownies

• Room Temperature: Store in an airtight container at room temperature for up to 3-4 days.

Frequently Asked Questions

Can I use regular cocoa powder instead of Dutch process?

Yes, you can, but Dutch process cocoa powder gives a deeper, darker chocolate flavor and color. Regular cocoa will still work, but the brownies might be slightly less intense.

Why do I need to beat the eggs and sugar for 5 minutes?

Beating the eggs and sugar for an extended period creates a light, airy base for the brownies. This aeration contributes significantly to their fudgy texture.

Can I make these ahead of time?

Absolutely! Brownies often taste even better the next day as the flavors meld. Store them in an airtight container at room temperature.

What if I don’t have quick oats?

Quick oats are best for the monster cookie dough’s texture. Rolled oats might make the cookies too chewy, and instant oats are too fine. Try to stick to quick oats for the best results.

How do I know when the brownies are done?

The brownies are done when there’s no jiggle in the center when you gently shake the pan. A toothpick inserted into the brownie part should come out with moist crumbs, not wet batter.

I genuinely hope these Monster Cookie Fudgy Brownies bring a big smile to your face and a happy buzz to your kitchen. They’re such a fun, indulgent treat and a personal favorite! If you bake them, please let me know how they turn out – I’d love to hear all about it!

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