These Loaded M&M Oreo Cookie Bars for St. Patrick’s Day are sure to leave your guests feeling satisfied. They are soft and chewy and packed with the sweet flavors of both M&M’s and Oreos, making them a perfect treat for the holiday.
If you love St. Patrick’s Day desserts like this one then you may also enjoy this Oreo St. Patrick’s Day Treats recipe. The M&M’s in these cookie bars add such a festive touch to make it great for this Irish inspired holiday.
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Oreo Cookie Bars
Oreo’s are a favorite cookie in our household. Did you know that Oreo was first invented in 1912? They are the world’s favorite cookie, so why not make them into a St. Patrick’s Day treat?
Why I Love This Recipe
These delectable bar cookies, perfect for St. Patrick’s Day, are sure to tantalize your taste buds and delight your guests with their soft and chewy texture as well as the sweet flavor of both M&M’s and Oreos.
- Easy to make
- Always a hit at parties
- Fills the house with a delicious aroma
- Only requires a few minutes of prep time.
If you love St. Patrick’s Day desserts, you may want to give these St. Patrick’s Day Meringue Cookies a try next time.
Ingredients
You only need a few simple ingredients to help you make this easy dessert recipe.
- M&M’s – For this recipe you will need the green and white mint M&M’s.
- Oreo Cookies – I used Mint Oreo cookies for this recipe.
- Chocolate Chips – I used semi-sweet chocolate chips for this recipe.
Substitutions
M&M’s: If you are not a fan of mint you can use green M&M’s instead.
Oreos: Instead of mint flavored Oreos you can use regular Oreos.
Variations / Options / Add-Ins
Here are a few of the ways that you can personalize this recipe so that it suits your needs.
Sprinkles: Sprinkles are a fun and colorful way to add an extra bit of festivity to this treat.
Marshmallows: Marshmallows can be added to this recipe too for an extra chewy texture.
Nuts: If you like some crunch to your cookie bars, then add some chopped pecans or walnuts to these cookie bars.
Equipment Needed / Helpful Tools
You only need a few kitchen tools to help you make this kid-friendly dessert recipe. Gather these tools and get ready to enjoy this festive St. Patrick’s Day dessert.
- Electric mixer – You can use a hand mixer or stand mixer to make this easy sweet treat.
- Baking sheet – You will need a 9×13 baking sheet that is lined with parchment paper.
- Large bowl – If you are using a hand mixer instead of your stand mixer you will need a large mixing bowl.
How to Make These Loaded M&M Oreo Cookie Bars
Making these cookie bars is so simple. Just follow the instructions below and you will have a dessert that is perfect for parties or after school.
Step 1: Preheat the oven and line your baking pan
Preheat your oven to 350 degrees and line your baking pan with parchment paper.
Step 2: Cream together the butter and sugar
Using a standing mixer, cream together the melted butter, sugar and brown sugar until combined.
Step 3: Add in the eggs slowly
Mix in the large eggs and egg yolk one at a time, mixing well after each egg.
Step 4: Add the vanilla
Mix in the vanilla
Step 5: Whisk the dry ingredients
In a medium bowl, mix together the all-purpose flour, cornstarch, baking powder and salt.
Step 6: Combine wet ingredients and dry ingredients
Gradually stir dry ingredients into the wet until completely combined.
Step 7: Fold in chocolate chips, M&M’s and Oreos
Mix in 1 ½ C chocolate chips, 1 ½ C M&M’s and half of the crushed oreos.
Step 8: Spread the batter into the pan
Spread the cookie dough into the prepared pan and sprinkle the top with the remaining chocolate chips, M&M’s and chopped Oreos.
Step 9: Bake until done
Bake 40 minutes or until edges just begin to turn golden brown.
Step 10: Cool before enjoying
Allow to cool before cutting and enjoying.
Serving Suggestions
I love to serve these sweet cookie bars with this Pub-Style Pretzel Roll Reuben recipe and a side of these Air Fryer Animal Style Fries.
Pro Tips
Here are a few tips to make sure that your bar cookies turn out perfectly every time that you make them.
- Make sure that you are using melted butter and not softened butter for this recipe.
- Measure out all of your ingredients before you begin baking, so that everything is ready when needed.
- Also, be sure to let these bars cool completely before cutting and serving so that they hold their shape.
- I prefer to use unsalted butter when baking, but salted butter can be used instead.
- To test for doneness insert a toothpick into the center of the cookie bars, if it comes out with a few moist crumbs then they are done.
- If you don’t have parchment paper, you can spray your baking dish well with nonstick cooking spray instead. Make sure to spray the sides of the pan well.
- If you want to add a little saltiness to this recipe, sprinkle some chopped pretzels or chocolate-covered pretzels on the top of the bars and then press them down with a spatula.
FAQs
Do you have questions about this M&M’s cookie bars recipe? Here are the answers to the most commonly asked questions for this loaded cookie bars recipe.
These Cookie Bars will stay fresh at room temperature for up to 3 days. To store the cookie bars, place them in an airtight container or covered with aluminum foil and keep them away from any heat or moisture.
Yes, you can freeze these bar cookies. Store them in the freezer in an airtight container for up to 3 months. When ready to enjoy, thaw overnight in the refrigerator before serving.
Yes, you can absolutely use other kinds of candy if you do not have access to M&M’s or Oreos. For example, instead of M&M’s you could use Reese’s Pieces or chopped peanut butter cups and instead of Oreos, you could use graham crackers or chocolate wafer cookies.
More St. Patrick’s Day Recipes
If you like festive green recipes, give these recipes a try:
- Instant Pot St. Patrick’s Day Hot Cocoa Bombs
- Easy Shamrock Cupcakes
- Green Cake Mix Cookies
- Instant Pot Andes Mint Cheesecake Bites
- Mickey Cinnamon Rolls for St. Patrick’s Day
Ready to get cooking? Print off the recipe card below or toggle on Cook Mode to keep your screen from going dark while you follow along on your phone or tablet.
📋 Recipe
Loaded M&M Oreo Cookie Bars
Equipment
- 9×13 baking dish lined with parchment paper
- Electric mixer
- Mixing bowls
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
- 2 cups Mint M&M’s
- 24 Mint Oreo cookies chopped
Instructions
- Preheat your oven to 350 degrees.
- Using a stand mixer, cream together the melted butter, sugar and brown sugar until combined.
- Mix in the eggs and egg yolks one at a time, mixing well after each egg.
- Mix in the vanilla.
- In a medium bowl, mix together the flour, cornstarch, baking powder and salt.
- Gradually stir dry ingredients into the wet until completely combined.
- Mix in 1 ½ C chocolate chips, 1 ½ C M&M’s and half of the chopped Oreos.
- Spread the batter into the baking dish and top with remaining chocolate chips, M&M’s and chopped Oreos.
- Bake 40 minutes or until edges just begin to turn golden brown.
- Allow to cool before cutting and enjoying.
Notes
- Make sure that you are using melted butter and not softened butter for this recipe.
- Measure out all of your ingredients before you begin baking, so that everything is ready when needed.
- Also, be sure to let these bars cool completely before cutting and serving so that they hold their shape.
- I prefer to use unsalted butter when baking, but salted butter can be used instead.
- To test for doneness insert a toothpick into the center of the cookie bars, if it comes out with a few moist crumbs then they are done.
- If you don’t have parchment paper, you can spray your baking dish well with nonstick cooking spray instead. Make sure to spray the sides of the pan well.
- If you want to add a little saltiness to this recipe, sprinkle some chopped pretzels or chocolate-covered pretzels on the top of the bars and then press them down with a spatula.