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 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 8 reviews

If you’re searching for a show-stopping dessert that satisfies every sweet craving and adds a fun, colorful twist to your baking repertoire, this Loaded M&M Oreo Cookie Bars Recipe is your new best friend. Imagine rich, buttery cookie bars packed full of melty chocolate chips, vibrant Mint M&M’s, and chunks of minty Oreo cookies all baked to gooey perfection. It’s the ideal treat to share with family or impress friends at your next gathering, blending classic flavors with an irresistible texture that will have everyone asking for seconds. This recipe celebrates everything delightful about cookies, reinvented as a thick, indulgent bar that’s as playful as it is delicious.

Ingredients You’ll Need

A clear glass bowl sits on a white marbled surface, filled with three main layers of ingredients. On one side, there are bright green candy-coated chocolates piled together smoothly. Next to them is a creamy off-white mix with a soft, thick texture piled in three rounded scoops. The remaining space is filled with crushed mint chocolate sandwich cookies, showing the dark chocolate pieces with light green cream inside spread unevenly over the creamy layer. photo taken with an iphone --ar 4:5 --v 7

The magic of this recipe lies in its delightful simplicity and how each ingredient contributes to the finale. From the creamy butter that gives richness to the dough, to the crisp texture of the Mint Oreos that add a refreshing twist, every component plays an essential role.

Unsalted sweet cream butter (2 cups, melted): Provides a rich, buttery base that keeps the bars soft and chewy.

Sugar (2 ½ cups): Balances sweetness and helps with that perfect golden crust.
Brown sugar (1 cup, packed): Adds depth with its caramel-like flavor and keeps the texture moist.
Eggs (4) and egg yolks (2): Bind the mixture and contribute to a tender crumb.

Vanilla extract (4 teaspoons): Enhances all the flavors with its warm, inviting aroma.
Flour (5 cups): The sturdy foundation that holds everything together.
Cornstarch (4 teaspoons): Keeps the bars soft and gives them a melt-in-your-mouth quality.

Baking powder (1 teaspoon): Provides just the right lift without overpowering.
Salt (2 teaspoons): Balances the sweetness and intensifies flavors.
Chocolate chips (2 cups): Luxury bursts of melty chocolate throughout every bite.
Mint M&M’s (2 cups): Adds whimsical color and a refreshing mint twist that’s totally addictive.

Mint Oreo cookies (24, chopped): Introduce crunch and cool minty flavor to elevate these bars to a whole new level.

How to Make Loaded M&M Oreo Cookie Bars Recipe

Step 1: Preheat and Prepare

Begin by preheating your oven to 350 degrees Fahrenheit, setting the stage for those cookie bars to transform into something spectacular. This step ensures even baking so your bars come out perfectly golden every time.

Step 2: Cream Butter and Sugars

Using a stand mixer, blend the melted butter with both sugars until everything is smooth and creamy. This creates a luscious base that contributes to the bars’ moist texture and incredible flavor depth.

Step 3: Add Eggs and Vanilla

Incorporate the eggs and extra yolks one at a time, mixing thoroughly after each addition. Then, pour in the vanilla extract, which will infuse the dough with a warm, fragrant note that makes these bars uniquely irresistible.

Step 4: Mix Dry Ingredients

In a separate bowl, whisk together the flour, cornstarch, baking powder, and salt. This dry mixture will provide structure while keeping the bars tender and light.

Step 5: Combine Wet and Dry Mixtures

Slowly add the dry ingredients to the wet mixture, stirring gently until everything is completely combined. This careful blending ensures your dough is perfect — not overworked but just cohesive enough to hold all those delicious add-ins.

Step 6: Fold in Chocolates and Oreos

Next, fold in one and a half cups each of chocolate chips and Mint M&M’s along with half the chopped Oreos. This adds bursts of flavor and texture within the dough that make every bite exciting and fun.

Step 7: Prepare for Baking

Spread the dough evenly into your baking dish, then sprinkle the remaining chocolate chips, Mint M&M’s, and Oreo chunks on top. This final touch creates a dazzling, colorful topping that bakes into a crunchy, chocolaty finish.

Step 8: Bake to Perfection

Bake the bars for 40 minutes until the edges turn a lovely golden brown. This signals that the bars are perfectly cooked — soft in the center with slightly crisp edges.

Step 9: Cool and Cut

Once out of the oven, allow the bars to cool completely before slicing. This step is crucial for clean cuts and for the bars to set into their indulgent, chewy texture.

How to Serve Loaded M&M Oreo Cookie Bars Recipe

The image shows a stack of thick, square bars made of a light beige dough mixed with dark cookie pieces and bright green candies. Each bar has three visible layers: a moist base, a thick middle layer filled with chunks of dark crushed cookies and green candy pieces, and a slightly crumbly top also dotted with cookie pieces and green candies. The bars are stacked casually on a wooden board, with one bar angled in front to show its texture clearly. The background is a white marbled texture, with a green cloth partially in view at the bottom right corner. photo taken with an iphone --ar 4:5 --v 7

Garnishes

To dress these bars up, sprinkle a little extra crushed Mint Oreos or a handful of whole Mint M&M’s on top just before serving. A light dusting of powdered sugar also adds a pretty, snow-like finish that enhances their sweetness without overpowering.

Side Dishes

Serve these bars alongside a scoop of vanilla ice cream or a dollop of whipped cream to balance the rich sweetness. Fresh berries, especially strawberries or raspberries, provide a bright contrast and add juicy freshness to each bite.

Creative Ways to Present

For a fun twist, cut the bars into small squares and serve them on a decorative platter with mini skewers for easy grabbing. You can also layer pieces between wax paper to create a pretty gift box or party favor that anyone would love to receive.

Make Ahead and Storage

Storing Leftovers

Keep any leftover bars in an airtight container at room temperature for up to 3 days. This keeps them soft and chewy while preserving those vibrant colors from the M&M’s and Oreos.

Freezing

You can freeze the bars wrapped tightly in plastic wrap and then in a freezer-safe container for up to 3 months. Thaw overnight at room temperature when you’re ready to enjoy, maintaining that fresh-baked quality.

Reheating

If you prefer warm bars, briefly heat individual pieces in the microwave for 10-15 seconds. This helps the chocolate chips melt again and revives that freshly baked experience.

FAQs

Can I substitute regular M&M’s or Oreos instead of the mint versions?

Absolutely! While the mint flavors add a refreshing twist, classic M&M’s and Oreos work just fine and will still give you that vibrant color and delicious texture.

Is it possible to make these bars gluten-free?

You can try substituting the flour with a gluten-free all-purpose blend and ensure your baking powder is gluten-free as well, but results may vary slightly in texture.

Can I use salted butter instead of unsalted?

Yes, but reduce or omit the added salt in the recipe to avoid over-salting. Unsalted butter just gives you more control over the final seasoning.

How thick should I spread the batter in the baking dish?

Spread the batter evenly in a standard 9×13-inch pan about 1 to 1 ½ inches thick for the best balance of gooey center and chewy edges.

Why do the bars need to cool completely before cutting?

Cooling helps the bars set up so they don’t crumble when cut, ensuring neat squares with a perfect, chewy texture that holds together.

Final Thoughts

You’ve got all the insider tips and steps to make the ultimate Loaded M&M Oreo Cookie Bars Recipe that will quickly become a beloved classic in your home. Whether for a casual family dessert or a festive celebration, these bars bring irresistible flavor, fun texture, and a burst of minty chocolate goodness in every bite. Don’t wait—bake a batch today and share the joy of this delightful treat with those you love!