Loaded with Peanut Butter, Oats & Chocolate Chips 🍪🍫
Hey Kitchies! 💛
If there’s one dessert that brings out my inner cookie monster — it’s these Thick & Chewy Monster Cookie Bars. Imagine everything you love about a classic monster cookie — peanut butter, oats, chocolate chips, and colorful M&M candies — all baked into soft, chewy bars that you can slice and share (or keep to yourself — no judgment here!).
These bars have quickly become a little family favorite in our home. They’re the kind of treat that disappears before they’ve even cooled down — perfect for bake sales, lunchboxes, or just because you’re craving something sweet.
Why You’ll Love These Monster Cookie Bars
✅ One bowl + no mixer needed
✅ Chewy, thick & peanut buttery
✅ Loaded with chocolate chips + M&Ms
✅ Easy to freeze
✅ Gluten-free friendly
Our Family’s Sweet Tradition 🍪
The first time I made these bars, my little one helped sprinkle the M&Ms on top and declared them “happy cookies.” Ever since, we’ve made them for every movie night or road trip. They’re that perfect mix of comfort + nostalgia — and let’s be honest, anything with M&Ms automatically makes life better.
Why These Monster Cookie Bars Are the BEST
- Soft + chewy texture
- Packed with peanut butter + oats
- Loaded with melty chocolate chips + crunchy M&Ms
- Made with no flour — naturally gluten-free!
Substitutions & Variations
Ingredient
Swap For
Why It Works
Peanut Butter
Almond Butter
Nut-Free Option
M&Ms
Chopped Reese’s
Chocolate + Peanut Butter Heaven
Quick Oats
Gluten-Free Oats
100% Gluten-Free
Make It Healthier 🌿
✅ Use natural peanut butter
✅ Swap sugar for coconut sugar
✅ Add chia seeds for extra fiber
How to Store + Freeze
Store in an airtight container at room temperature for 3-4 days
Freeze in layers with parchment paper for up to 3 months
FAQs
Can I make these without peanut butter?
Absolutely! Swap peanut butter for almond butter or sunflower seed butter.
Can I make these gluten-free?
Yes! Just use certified gluten-free oats.
Can I add other mix-ins?
Go for it! Try chopped nuts, shredded coconut, or white chocolate chips.
Do I need to chill the dough?
Nope! These bars are quick + no-fuss — just mix, press, and bake.
And there you have it!
These Thick & Chewy Monster Cookie Bars are the ultimate crowd-pleasing treat — buttery, peanut buttery, and packed with chocolate in every bite. Whether you’re making them for a weekend treat or a special celebration, they’ll always disappear faster than you can say, “Save me one!”
If you try this recipe, tag @KitchiesKitchen — I love seeing your sweet creations!
Craving More Easy Desserts?
No Bake S’mores Bark
Cookie Dough Delight Cake
Blueberry Lemon Crumble
Categories:
Dessert | Bars | Kid-Friendly
Tags:
#MonsterCookies #PeanutButterLovers #EasyDesserts
Thick & Chewy Monster Cookie Bars
Description
If there’s one dessert that brings out my inner cookie monster — it’s these Thick & Chewy Monster Cookie Bars.
Ingredients
| Ingredient | Measurement |
|---|---|
| Unsalted Butter | ½ cup (melted) |
| Creamy Peanut Butter | ¾ cup |
| Brown Sugar | ¾ cup (packed) |
| Granulated Sugar | ½ cup |
| Eggs | 2 large |
| Vanilla Extract | 1 tsp |
| Quick Oats | 2 cups |
| Baking Soda | 1 tsp |
| Mini Chocolate Chips | ½ cup |
| M&Ms | ¾ cup (plus extra for topping) |
Instructions
Preheat your oven to 350°F (180°C).
In a large bowl, whisk together melted butter, peanut butter, brown sugar, and granulated sugar until smooth.
Stir in eggs and vanilla extract until creamy.
Mix in oats, baking soda, chocolate chips, and M&Ms until everything is combined.
Line a 9×13-inch pan with parchment paper and press the dough evenly into the pan. Sprinkle extra M&Ms on top (because more is always better, right?).
Bake for 18-22 minutes until the edges are golden but the center is still soft.
Let cool completely before slicing into bars (if you can wait that long!).
