Loaded Oreo M&M Cookie Bars Recipe

4.20 / 5 ( 5 Reviews )
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Oreo blondies

Loaded M&M Oreo Cookie Bars

These M&M cookie bars are an especially fun treat for kids! My kids love the bright colors of the M&M’s and can’t resist these candy – and cookie – filled bars. Of course, plenty of adults can’t resist them either. That’s why they’re a great treat to bring to parties!

To make these loaded cookie bars you can pretty much take your favorite blondies recipe and add whatever cookies and candies you have around the house for a fun treat! I tried a few different recipes and decided that this particular blondies recipe has a great flavor and texture.

M&M Cookies bars ingredients


Instead of Oreo cookies and M&M’s, you can try adding chopped nuts, chocolate chips, dried fruit, pretzels, chopped candy bars, or whatever other sweets you love and have hanging out in the cupboards. Have some fun with it!

Crushed oreos

Recipe Tips

If you have a large microwave-safe bowl, you can melt the butter in the microwave while it is already in the mixing bowl. Save yourself a dirty dish when you can, right?

For the Oreos, I use a gallon-size resealable bag and a rolling pin to coarsely crush the Oreo cookies. I like keeping most of the Oreo cookies in big chunks for some extra texture and variance in the blondies batter. Use a rubber spatula to fold the additions into the batter and avoid over-mixing.

Oreo blondie cookies ready to bake

Baking the Bars

Spread the batter into a foil-lined and sprayed pan, then sprinkle the candies evenly all over the top. I was pretty generous with my M&M’s as you can see from the photo above!

When making cookie bars and more, a foil-lined pan is awesome because the foil sling allows for easy removal from the pan. Once removed, it is super easy to cut the cookies into bars.

Cut oreo cookie bars

Cutting the Oreo M&M Cookie Bars

Although you could use pretty much any knife to cut your cookie bars, I actually happen to have a 14″ rocker-style pizza cutter that makes cutting cookie bars even easier and faster. Who knew it would be so handy!

New Star 50646 Commercial Grade Stainless Steel Rocker-Style Deluxe Pizza Knife, 20-Inch

Final Thoughts

If you love M&M cookies you’re going to love these loaded Oreo M&M cookie bars even more. The crushed Oreos really add a lot of sweetness and deliciousness! Just make sure to have a glass of milk on hand to wash it all down. 😉

Loaded M&M oreo cookie bars

More of my favorite bar recipes:

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Recipe inspired by Averie Cooks and adapted from the blondies recipe in Cooks Illustrated Cookbook.

Oreo m&m bars

Oreo blondies

Loaded Oreo M&M Cookie Bars Recipe

The ultimate cookie bar loaded with crushed Oreos and delicious M&Ms.
4.20 / 5 ( 5 Reviews )
Print Rate
Prep Time: 15 minutes
Cook Time: 40 minutes
Total Time: 55 minutes
Serves: 24
Adjust Servings: 24


  • 9x13-inch pan



  • Preheat oven to 350°F/175°C.
  • Line a 9x13 baking dish or pan with foil and spray with nonstick cooking spray.
  • In a large microwave-safe bowl, heat the butter in the microwave until melted.
  • Remove from microwave and whisk in the sugar and vanilla.
  • Then add the eggs and mix until smooth.
  • In a medium bowl, whisk together the flour, baking powder, and salt.
  • Then add the dry ingredients to the wet and stir until just combined; don't overmix.
  • With a rubber spatula, fold in the crushed Oreo cookies (or about 2 cups of other crushed cookies or candy).
  • Scrape the batter into the prepared pan, smoothing the top with the spatula.
  • Sprinkle the M&M's (or other small pieces of candy) over the top evenly and lightly press them down into the surface of the batter.
  • Bake for about 30-40 minutes, or until the top is firm, cracked, and golden.
  • Baking times may vary depending on the mix-ins and the type of pan.
  • A toothpick inserted into the center should come out clean or have moist crumbs attached, but not gooey batter. Transfer pan to a cooling rack and allow bars to cool in the pan for at least 30 minutes.
  • Then remove the bars from the pan (by lifting the foil out), cut them into bars, and serve.

Recipe Notes

Store in an airtight container at room temperature for up to 5 days, or in the freezer for a few months.


Calories: 251kcal | Carbohydrates: 36g | Protein: 3g | Fat: 11g | Sodium: 143mg | Fiber: 1g | Sugar: 25g
Ingredients: All-purpose flour, Baking Powder, Brown Sugar, Butter, Egg, Salt, Vanilla Extract
Meal Type: Desserts, 4th of July, Father's Day, Super Bowl Party, Meatless
Categories: Brownies and Bars, Oven

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