Monster Cookie Fudgy Brownies

By SandraAugust 28, 2025

Table of Contents

Fancy something a bit naughty? Something that'll make your eyes roll back in your head? Well, get this: Monster Cookie Brownies are about to rock your world.

This is not your average chocolate chip brownie recipe .

The Ultimate Dessert Mashup Recipe

These Monster Cookie Brownies are a total game-changer. Think classic fudgy brownies recipe meets the madcap deliciousness of a monster cookie bar .

Originating from the good ol' U.S. of A, monster cookies are known for their wild mix of oats, peanut butter, and chocolate chips.

This recipe is easy, taking about 45 minutes to an hour including cooling. Makes 12 brownies, perfect for sharing… or not!

What Makes These Brownies Special?

Imagine a brownie that’s both intensely chocolatey and packed with texture. It's also a really good oatmeal brownie recipe ! The oats add a delightful chewiness, and the peanut butter gives it a nutty depth.

Plus, it's an easy brownie recipe , so even if you're not a baking wizard, you can nail it. Bake these for a party or just a seriously good afternoon snack.

It's the perfect dessert mashup recipe , especially if you love M&M brownie bars .

Ready to dive in? Next, we'll get down to the ingredients list.

Ingredients & Equipment: Let's Get Started!

Right, before we get cracking with these Monster cookie brownies , let's make sure we've got everything we need. Honestly, half the battle is just getting organised, innit? This easy brownie recipe isn't complicated.

But having your ingredients measured out makes life a million times easier. Think of it as your culinary backstage pass to dessert mashup recipes !

Main Ingredients: The Stars of the Show

Here’s what you'll need to create these amazing Monster cookie bars .

Melted Butter: 1 cup (2 sticks, 226g ) unsalted. Good quality butter makes a difference. Go for proper butter, not that spread stuff.
Granulated Sugar: 2 cups ( 400g ).
Large Eggs: 4 .
Vanilla Extract: 1 teaspoon ( 5ml ).
Creamy Peanut Butter: ½ cup ( 120g ). Smooth as you can get it. We're going for a flavour explosion, not a sticky mess.
All-Purpose Flour: 1 cup ( 125g ). Plain flour, nothing fancy.
Unsweetened Cocoa Powder: 1 cup ( 85g ). Good quality cocoa gives you that rich fudgy brownies recipe .
Baking Powder: 1 teaspoon ( 4g ).
Salt: ¼ teaspoon ( 1.5g ).
Old-Fashioned Rolled Oats: 1 cup ( 80g ). These give that signature oatmeal brownie recipe touch.
Semi-Sweet Chocolate Chips: 1 cup ( 170g ).
M&M’s: ½ cup (approx. 85g ), plus extra for topping. M&M brownie bars are always a hit!

Seasoning Notes: Flavour Boosters

Let's talk about flavour!

The Magic Combo: Cocoa, peanut butter, and chocolate chips? Oh my gosh, it’s a flavour match made in heaven.
Vanilla Extract: Don’t skip it. It enhances all the other flavours.
Peanut Butter Swirl: You can use almond butter instead. The Peanut butter brownie recipe is a win no matter what!

Equipment Needed: The Bare Essentials

You really don't need loads of fancy kit for this chocolate chip brownie recipe .

9x13 inch Baking Pan: Absolutely essential.
Large Mixing Bowls: At least two.
Sifter or Sieve: For the cocoa powder. Lumpy cocoa is a no-no.
Microwave-Safe Bowl: For melting the peanut butter.
Whisk or Electric Mixer: A whisk is perfectly fine.
Parchment Paper: Makes getting the brownies out so much easier.

That’s it! You don't need a professional kitchen to bake homemade brownies . Now you're ready to dive into the world of chewy brownie recipe goodness. Let's get baking!

Cooking Method

Honestly, baking is like a little science experiment. It takes practice. Especially if you're aiming for the perfect bake with that extra bit of oomph ! Let's talk about how to nail this Monster cookie brownies recipe.

No more sad brownies!

Prep Steps: Getting Your Ducks in a Row

First, mise en place . That's fancy chef talk for "get your stuff together." Measure out all the ingredients before you start.

Melt your butter. Sounds simple, yeah? It's essential for an easy brownie recipe . And remember, safety first! Don't burn yourself with that molten butter.

Think of it as your pre-game warm-up. Plus, weighing them ensures you get the right quantities and your Monster cookie bars are perfect every time. Got it? Ace!

Step-by-Step to Brownie Bliss

Preheat your oven to 350° F ( 175° C) . Grease your 9x13 inch pan. Or line it with parchment for easy removal.
Melt the butter and let it cool slightly. Don't skip the cooling part or you'll cook the eggs!
Mix the melted butter and sugar. Then, add the eggs one at a time. Stir in the vanilla.
Sift together the flour, cocoa powder, baking powder, and salt. This stops lumps!
Gradually add the dry ingredients to the wet. Don't overmix!
Fold in the oats, chocolate chips, and M&Ms. Save some M&Ms for topping.
Warm the peanut butter. It should be pourable.
Pour half the batter into the pan. Drizzle half the peanut butter. Repeat. Swirl it with a knife or skewer. Top with the remaining M&Ms. Bake for 25- 30 minutes . A toothpick should come out with moist crumbs. Not wet batter.

Pro Tips: Secrets from My Kitchen

Avoid overbaking. That's the key to a chewy brownie recipe . Aim for fudgy goodness.
Don't be tempted to slice too soon! Let those brownies cool completely. The patience to wait is difficult, but so worth it!
Want to level up? Use really good chocolate. The better the chocolate, the better these homemade brownies will be. Trust me!

These Monster cookie brownies are like the lovechild of an oatmeal brownie recipe and a fudgy brownies recipe . It's the ultimate dessert mashup recipes and M&M brownie bars ! Hope you enjoy it.

Recipe Notes: Level Up Your Brownie Game!

Alright, let's chat about making these Monster cookie brownies truly epic. I've got a few tips, tricks, and serving suggestions to make your bake stand out.

Seriously, this easy brownie recipe is a total game-changer.

Serving Suggestions: Making 'Em Look the Business

Presentation is key, innit? For plating, think simple but stylish. A dusting of icing sugar adds a touch of elegance.

Fancy a bit extra? A scoop of vanilla ice cream is always a winner. Hot fudge sauce? Oh go on then, you deserve it! These brownies are also amazing with M&M brownie bars on top.

As for drinks, a strong cuppa is the classic choice. But, a glass of cold milk works a treat too.

Even better, a shot of Irish cream liqueur in your coffee. Don't say I didn't warn you!

Storage Tips: Making 'Em Last (If They Even Can!)

Right, let's talk storage. Honestly, these chewy brownie recipe Monster cookie brownies rarely last a day in my house. But if you do have leftovers, here's the gen:

Refrigeration: Pop 'em in an airtight container, and they'll be good for up to 3 days.
Freezing: Wrap 'em individually in cling film, then bung 'em in a freezer bag. They’ll happily chill there for up to 2 months.
Reheating: If frozen, let them thaw at room temperature. For a warm treat, microwave for 15-20 seconds . But honestly? They're perfect straight from the fridge!

Variations: Get Creative with Your Bakes

Fancy a twist? You got it.

Gluten-Free: Swap the all-purpose flour for a 1:1 gluten-free blend. Sorted! This is a great variation for the oatmeal brownie recipe !
Nut Allergy? No worries! Swap the peanut butter for sunflower seed butter. You can also add other chocolate chip brownie recipe to make it more fun!.

I've also been known to chuck in some chopped nuts or even a swirl of caramel. Honestly, you can adapt this Fudgy brownies recipe to whatever you fancy!

Nutrition Basics: A Little Bit of What You Fancy

Okay, so Monster cookie brownies aren't exactly health food. But everything in moderation, eh? One brownie clocks in at roughly 320 calories , with about 5g of protein , 15g of fat , and 45g of carbs .

But hey, they're good for the soul, right?

So there you have it. All my top tips for nailing these awesome dessert mashup recipes . Don't be afraid to experiment, have fun, and enjoy every delicious bite of your homemade brownies .

Happy baking, lovely! Now you can truly enjoy this peanut butter brownie recipe !

Frequently Asked Questions

Can I substitute anything for the peanut butter in these Monster cookie brownies? My little one's got a nut allergy.

Absolutely! If you're dealing with a nut allergy, sunflower seed butter (sunbutter) or even tahini (sesame seed paste) works as a great substitute for peanut butter in these Monster cookie brownies. Just make sure you also double-check all your other ingredients for potential allergens, like certain brands of chocolate chips.

My brownies always turn out dry! What am I doing wrong when I'm making Monster cookie brownies?

Dry brownies are a common baking woe! The biggest culprit is usually overbaking. Start checking for doneness a few minutes before the recommended bake time - you want a toothpick inserted into the center to come out with moist crumbs attached. Also, make sure you're not overmixing the batter once you add the dry ingredients, as this can develop the gluten too much and lead to a tougher brownie.

How do I store these Monster cookie brownies to keep them fresh?

To keep your Monster cookie brownies nice and fudgy, store them in an airtight container at room temperature. They'll stay fresh for about 3-4 days. For longer storage, you can wrap them individually in plastic wrap and freeze them for up to 2-3 months. Just let them thaw at room temperature before enjoying a slice with your cuppa!

Can I make these Monster cookie brownies gluten-free?

Yes, you absolutely can! Simply substitute the all-purpose flour with a 1:1 gluten-free baking flour blend. Make sure the blend contains xanthan gum or another binding agent to help with the structure of the brownies. Always double-check that all your other ingredients, like oats and chocolate chips, are certified gluten-free to avoid any cross-contamination.

Can I add other ingredients to these Monster cookie brownies?

Crikey, yes! That’s the beauty of monster cookies, innit? Feel free to add chopped walnuts or pecans, pretzels for a salty kick, or even different types of chocolate chips like white chocolate or peanut butter chips. Just remember not to overfill the batter, or they might not bake properly.

Monster Cookie Fudgy Brownies