Name: Loaded M&M Oreo Cookie Bars Recipe
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: American
Ingredients: 2 cups unsalted sweet cream butter, melted; 2 1/2 cups sugar; 1 cup brown sugar, packed; 4 eggs; 2 egg yolks; 4 teaspoons vanilla extract; 5 cups all-purpose flour; 4 teaspoons cornstarch; 1 teaspoon baking powder; 2 teaspoons salt; 2 cups chocolate chips (divided); 2 cups Mint M&M’s (divided); 24 Mint Oreo cookies, chopped (divided)

Jump to Recipe· 3.9 from 70 reviews

If you have a serious sweet tooth and love a little bit of everything in your dessert, then this Loaded M&M Oreo Cookie Bars Recipe is about to become your new obsession. Imagine soft, buttery cookie bars packed with melty chocolate chips, colorful Mint M&M’s, and those wonderfully crisp Mint Oreo cookies all baked to golden perfection. Each bite is a delightful blend of chewy, crunchy, and chocolaty that feels like a celebration in your mouth. This recipe delivers so much flavor and texture; it’s perfect for sharing with friends or satisfying your own cookie cravings any time of the day.

Ingredients You’ll Need

A clear glass bowl holds three main components arranged side by side. On the left, there is a pile of shiny bright green candy-coated chocolates. To the right, there is a large dollop of smooth creamy beige mixture. Covering the top right section are many small pieces of dark chocolate cookies with visible green cream filling. The bowl is placed on a white marbled surface. photo taken with an iphone --ar 4:5 --v 7

This Loaded M&M Oreo Cookie Bars Recipe uses simple but powerful ingredients that come together to create a gorgeous mix of flavors and textures. Each component plays a key role—from the rich butter that keeps the bars tender, to the Mint Oreos and M&M’s adding a playful crunch and burst of color.

Unsalted sweet cream butter (2 cups, melted): Provides a rich, creamy base for perfect texture and flavor.

Sugar (2 1/2 cups): Sweetens the bars and helps with chewy edges.
Brown sugar (1 cup, packed): Adds moisture and a slight caramel undertone.
Eggs (4) and egg yolks (2): Keep the bars moist and help bind ingredients together seamlessly.

Vanilla extract (4 teaspoons): Enhances all the sweet flavors with warm, inviting notes.
Flour (5 cups): Gives structure to the bars while ensuring softness.
Cornstarch (4 teaspoons): Keeps the texture tender and light.
Baking powder (1 teaspoon): Helps the bars rise just enough without being cakey.

Salt (2 teaspoons): Balances the sweetness and intensifies the flavors.
Chocolate chips (2 cups): Delivers pockets of melty chocolate goodness throughout.
Mint M&M’s (2 cups): Brings a festive pop of color and refreshing minty crunch.

Mint Oreo cookies (24, chopped): Adds crispy texture and iconic mint-chocolate flavor surprises in every bite.

How to Make Loaded M&M Oreo Cookie Bars Recipe

Step 1: Preheat and Prep

Start by preheating your oven to 350 degrees. This ensures that once your batter is ready, you can bake it immediately for those perfect golden edges and soft center. Taking this step seriously means your bars will bake evenly and come out just right.

Step 2: Cream Butter and Sugars

In a stand mixer, combine the melted butter, sugar, and brown sugar until they blend into a smooth, luscious mixture. This is the foundation of your bars’ sweetness and texture, so mix until well combined but don’t overwork it.

Step 3: Add Eggs and Vanilla

One at a time, mix in the eggs and egg yolks, making sure each is fully incorporated before adding the next. Then stir in the vanilla extract, which will add a rich aroma and deepen the flavor complexity perfectly.

Step 4: Combine Dry Ingredients

In a separate bowl, whisk the flour, cornstarch, baking powder, and salt together until well blended. This combination provides the structure and tenderness that makes these cookie bars so irresistibly soft yet sturdy.

Step 5: Mix Dry into Wet

Gradually add the dry ingredients to the wet mixture, stirring carefully until everything is completely combined. This gentle mixing helps keep the bars tender and prevents overworking the dough.

Step 6: Fold in Chocolate Chips, M&M’s, and Oreos

Stir in 1 ½ cups of chocolate chips, 1 ½ cups of Mint M&M’s, and half of the chopped Mint Oreos. These mix-ins are the heart and soul of your Loaded M&M Oreo Cookie Bars Recipe, bringing bursts of flavor and delightful textures in every bite.

Step 7: Spread, Top, and Bake

Press the batter evenly into your baking dish. Then, sprinkle the remaining chocolate chips, M&M’s, and chopped Oreos on top. This not only looks beautiful but adds an irresistible candy-coated crunch on the surface. Bake for 40 minutes or until the edges start glowing golden.

Step 8: Cool and Slice

Let your bars cool fully before slicing. This step helps everything set so the bars cut cleanly and stay intact while you indulge in gooey chocolate and minty Oreo goodness.

How to Serve Loaded M&M Oreo Cookie Bars Recipe

The image shows a stack of thick dessert bars with two visible layers: the base layer is light beige with a slightly crumbly texture mixed with green and brown candy pieces, while the top layer is covered with crushed dark chocolate cookie chunks and more green candy pieces embedded throughout. The bars are placed on a light wooden board, with a soft focus white marbled background, and a green cloth with white stripes is partially visible in the foreground. photo taken with an iphone --ar 4:5 --v 7

Garnishes

Sprinkle extra mini M&M’s or crushed Oreos over each bar slice for a festive, colorful touch. A light dusting of powdered sugar can also add a charming, bakery-style finish.

Side Dishes

These bars are super rich, so pairing them with a simple scoop of vanilla ice cream or a cup of cold milk balances out the sweetness beautifully and elevates your dessert experience.

Creative Ways to Present

Try serving these bars on a pretty dessert platter dusted with crushed mint leaves for an unexpected fresh twist. Or layer them in a glass trifle with whipped cream and chocolate sauce for an eye-catching dessert centerpiece.

Make Ahead and Storage

Storing Leftovers

Keep any leftover cookie bars in an airtight container at room temperature for up to 5 days. This keeps them soft but still fresh enough to enjoy each decadent bite as if just baked.

Freezing

You can freeze these bars by wrapping them tightly in plastic wrap and placing them in a freezer bag. They’ll keep well for up to 2 months, making them great to prepare ahead for special occasions.

Reheating

Warm up your frozen or refrigerated bars in the microwave for about 15 seconds or until soft and melty. This revives that fresh-from-the-oven feel, perfect for an indulgent treat anytime.

FAQs

Can I use regular M&M’s instead of Mint M&M’s?

Absolutely! While Mint M&M’s add a refreshing hint of mint that complements the Oreos, classic M&M’s work wonderfully too if you prefer a traditional chocolate flavor throughout.

Do I need to melt the butter first?

Yes, melting the butter helps to create a dense, chewy texture in the bars. It also makes it easier to cream together with the sugars for a smooth base.

Why is cornstarch included in the recipe?

Cornstarch softens the overall texture, helping the cookie bars stay tender and moist rather than cakey or crumbly.

Can I make these bars gluten-free?

To make these gluten-free, use a 1-to-1 gluten-free baking flour blend in place of regular flour. Just be sure it contains xanthan gum for structure.

What’s the best pan size to bake these cookie bars?

A standard 9×13-inch baking dish works best for even baking and the perfect bar thickness. Using a larger pan might result in thinner, less chewy bars.

Final Thoughts

If you’re looking for a delightful, crowd-pleasing dessert that blends the best of cookies and candy, this Loaded M&M Oreo Cookie Bars Recipe is your go-to. Each step is straightforward, and the reward is a tray full of heavenly bars bursting with chocolate, mint, and irresistible texture. Give these bars a try—you’ll be handing out your recipe more than the bars themselves, guaranteed!