Loaded M&M’s Oreo Cookie Bars – The Ultimate Sweet Treat

There’s something magical about desserts that bring together all our favorite indulgences into one heavenly bite. That’s exactly what these Loaded M&M’s Oreo Cookie Bars do—each bite is chewy, chocolatey, crunchy, and sweet in the best way possible. Imagine a buttery cookie base layered with Oreo chunks, colorful M&M’s, and sweetened condensed milk that melts everything together into gooey perfection. Whether you’re baking for a party, holiday, bake sale, or just a cozy weekend treat, these bars are guaranteed to be a crowd-pleaser.

These cookie bars are as fun to look at as they are to eat—bright pops of M&M’s against the dark crumbles of Oreo give them that playful look that makes kids and adults equally excited to grab a square. Plus, they’re ridiculously easy to whip up: no fancy skills required, just a few bowls, a baking pan, and about half an hour of your time.

Ingredients:

• 2 cups all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 3/4 cup unsalted butter, melted
• 1 cup brown sugar, packed
• 1/2 cup granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 1/2 cups chopped Oreo cookies (about 12 cookies)
• 1 cup M&M’s (plus extra for topping)
• 1 can (14 oz) sweetened condensed milk

Instructions:

1. Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving some overhang for easy removal.
2. In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
3. In a large bowl, mix melted butter, brown sugar, and granulated sugar until smooth.
4. Beat in eggs one at a time, then add vanilla extract.
5. Gradually add the dry ingredients into the wet mixture, stirring until just combined.
6. Gently fold in chopped Oreos and M&M’s, reserving a few for topping.
7. Spread the cookie dough evenly into the prepared baking pan.
8. Drizzle the sweetened condensed milk over the top, making sure it covers the surface evenly.
9. Sprinkle the reserved Oreos and M&M’s over the top for a colorful finish.
10. Bake for 28–32 minutes, or until the edges are golden brown and the center is set but slightly gooey.
11. Remove from oven and cool completely before cutting into bars.

Tips & Tricks:

• For extra richness, add 1/2 cup of chocolate chips to the batter.
• Use holiday-colored M&M’s (red & green, pastel, etc.) to make these bars seasonal.
• Let the bars cool fully before slicing for the cleanest cuts.

Loaded M&M’s Oreo Cookie Bars

Chewy, gooey cookie bars loaded with Oreo chunks, colorful M&M’s, and sweetened condensed milk.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Servings: 16 bars

Course: Dessert, Snack

Cuisine: American

Calories: 280

Ingredients Equipment Method Notes

Ingredients

  

Cookie Dough

• 2 cups all-purpose flour
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 3/4 cup unsalted butter, melted
• 1 cup brown sugar, packed
• 1/2 cup granulated sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 1/2 cups chopped Oreo cookies about 12 cookies
• 1 cup M&M’s plus extra for topping
• 14 oz sweetened condensed milk 1 can

Equipment

• Mixing bowls
• Baking pan
• Parchment paper
• Wooden spoon or spatula

Method

 

1. Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper.
2. Whisk flour, baking soda, and salt in a medium bowl.
3. Mix melted butter, brown sugar, and granulated sugar in a large bowl until smooth.
4. Beat in eggs one at a time, then add vanilla extract.
5. Gradually add dry ingredients to wet, mixing until combined.
6. Fold in chopped Oreos and M&M’s, reserving some for topping.
7. Spread dough evenly into pan. Drizzle condensed milk over top.
8. Sprinkle reserved Oreos and M&M’s on top.
9. Bake 28–32 minutes until golden at edges and set in center.
10. Cool completely before slicing into bars.

Notes

Bars slice best when completely cooled. Store at room temperature or freeze for longer storage.

Variations:

• Swap Oreos for peanut butter cookies or graham crackers for a twist.
• Add chopped nuts like walnuts or pecans for crunch.
• Use mini M&M’s for a more even distribution throughout the bars.

Serving Suggestions:

• Serve warm with a scoop of vanilla ice cream for a decadent dessert.
• Cut into small squares for bite-sized party treats.
• Pair with a glass of cold milk or a hot cup of coffee.

Storage Information:

• Store bars in an airtight container at room temperature for up to 4 days.
• Refrigerate for up to a week, or freeze for up to 3 months (wrap individually in plastic wrap for best results).

FAQ:

• Can I use double-stuffed Oreos? Yes! The extra cream filling just adds more gooey goodness.
• Do I need to chill the dough? No, this recipe works best baked immediately.
• Can I halve the recipe? Absolutely—use an 8×8-inch pan and bake for about 25 minutes.

History / Fun Facts:
The concept of “loaded bars” came from the trend of kitchen-sink desserts—recipes where bakers toss in every sweet treat they can find. Oreos, invented in 1912, and M&M’s, launched in 1941, are two of America’s most beloved candies. Bringing them together in one gooey cookie bar feels like a celebration of childhood nostalgia and pure indulgence in every bite.