Monster Cookie Bars: The Sweetest Chaos in a Pan

Ever just craved something sweet but also super satisfying? Like, something that says, “Hey, you deserve this”? Yup, that’s where these Monster Cookie Bars come in. They’re like if a cookie had a party, and EVERYONE was invited. Seriously, if you haven’t tried ’em, you’re in for a treat (pun intended)!

Main dish photo — *The finished dish — looks amazing, right?*

Okay, Let’s Talk Ingredients

Alright, so imagine we’re wandering the aisles of the grocery store, right? First off, grab a stick of salted butter — we’re talking 1/2 cup of that creamy goodness. Now, don’t forget the peanut butter! (I mean, how can you?) You’ll need 1/4 cup.

Then, hit the baking aisle for 1 cup of brown sugar and 1/4 cup of granulated sugar. Just a little sweet, ya know? Next up, 2 eggs and 2 tsp of vanilla extract. This is where the magic starts!

Then, you’ll need 2 cups of all-purpose flour — but like, the kind that just sits in your pantry waiting for this moment. And, of course, 1 cup of rolled oats (get the big ones, trust me).

Oh, and we can’t forget about the leavening agents: 1 tsp of baking soda, 1/2 tsp of baking powder, and a pinch (or 1/2 tsp, if you’re being precise) of salt.

And the best part? You gotta have chocolate chips — like, a whole cup of semi-sweet ones — and then 3/4 cup of M&Ms. Because why not?!

So Here’s Why I Make This Constantly

Okay, so here’s my little story. I whipped these up one rainy Saturday when I was just, like, super bored and wanted something fun to eat (aka, I was avoiding chores, lol). I had all the stuff already, which is like, the best feeling ever.

I started mixing the butters and sugars, and the smell just hit me like a wave of nostalgia. My grandma used to make something similar but in cookie form, and oh man, those days of licking the batter bowl were the best!

Anyway, I was just mindlessly pressing the dough into the pan, and I realized — my kids (okay, *my husband too*) were gonna demolish these. And they did. Like, gone within hours. I barely got a piece! 😭

Another beautiful angle of the dish — *Just as gorgeous from this angle too!*

(Another beautiful shot because we can’t get enough!)

The One Trick That Changes Everything

Alright, listen up. When you mix the dough, don’t overdo it! Just until it’s all combined. If you mix too much, you’re gonna end up with tough bars — and nobody wants that. So, channel your inner zen and be gentle with it.

Don’t Mess This Up (My Top Tips)

1. Parchment paper is your friend. Seriously, don’t skip it. Otherwise, you’ll be wrestling the bars out of the pan like it’s a slippery fish.

2. Check your oven temp! You know how your oven can be a little moody? Mine is. So, maybe start checking at 25 minutes, just in case. You want golden brown, not charcoal!

3. Let them cool completely! I know it’s hard, but patience is a virtue here. Otherwise, they’ll crumble when you try to slice ‘em.

How to Keep Them From Disappearing (Or, How to Store Them)

So, if you manage to not eat them all in one go (good luck!), store these bad boys in an airtight container. They’ll last about 3-4 days at room temp. But let’s be real — they probably won’t last that long!

If You Liked This, You’ll Probably Like These Too

If you dig these Monster Cookie Bars, you might wanna check out my No-Bake Peanut Butter Oatmeal Cookies next. Or, if you’re feeling adventurous, try my Brownie Cookie Mashup! They’re both equally delicious and slightly chaotic.

So, what do you think? Are you ready to dive into this cookie bar adventure? Let me know if you give it a shot! 🍪❤️

Monster Cookie Bars

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Indulge in the delightful taste of Monster Cookie Bars, a perfect blend of chocolate, peanut butter, and oats. These soft and chewy bars are loaded with M&Ms and make for a tasty treat for any occasion. Whether you’re hosting a party or simply craving something sweet, these cookie bars are sure to become a favorite!

Author: XXXXX
Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Yield: Serves 16 1x
Category: Dessert
Method: Baking
Cuisine: American

Ingredients

Scale

1/2 cup salted butter (softened)
1/4 cup peanut butter
1 cup brown sugar
1/4 cup granulated sugar
2 eggs
2 tsp vanilla extract
2 cups all-purpose flour
1 cup rolled oats
1 tsp baking soda
1/2 tsp baking powder
1/2 tsp salt
1 cup semi-sweet chocolate chips
3/4 cup M&Ms

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Instructions

Preheat your oven to 350°F and line a 9×9 inch pan with parchment paper.
In a mixing bowl, cream together the softened butter, peanut butter, brown sugar, and granulated sugar until smooth.
Beat in the eggs and vanilla extract until well combined.
Gradually add in the flour, oats, baking soda, baking powder, and salt; mix until a sticky dough forms.
Stir in the chocolate chips and M&Ms until evenly distributed.
Pour the mixture into the prepared pan and press it down lightly.
Bake for 25-30 minutes or until golden brown on top.
Allow to cool completely before cutting into bars.