Need an easy dessert recipe to serve a crowd? These Chocolate Chip M&M Cookie Bars are perfect for any party! Just mix, bake, slice and done!
Chocolate Chip M&M Cookie Bars
I love making dessert recipes that are easy and delicious! These Chocolate Chip M&M Cookie Bars are perfect all year long for any type of party or celebration, or even just as an after school sweet treat. Chocolate chip cookies are such a classic dessert so adding colorful M&M’s and turning them into cookie bars is a great twist on the classic! Everyone will love these! Get ready because this will be a new staple in your recipe book!
The Best Cookie Bars
Cookie bars should be your best friend. What are cookie bars? They’re essentially a massive cookie casserole. After you bake it, you cut it up into squares to serve! It saves you so much time because you don’t have to make individual dough balls or sit in the kitchen pulling cookie sheets in and out of the oven. Just bake one biiig cookie and then cut it up into smaller portions, genius! I love these Chocolate Chip M&M Cookie Bars because the texture is perfect and the color from the M&M’s make them all dressed up for a party. If you love cookie bars make sure you check out my Sugar Cookie Bars and 7th Heaven Bars!
How to Make Cookie Bars
Why take the time to scoop and bake 30+ m&m cookies when you can make these? To make cookie bars, mix cookie dough as normal in your mixer. Then you’ll dump the dough mixture into your casserole dish and use a spatula to spread the dough out evenly. Sometimes I like to sprinkle a few extra M&M’s on top to make them extra colorful. I also like to sprinkle a little kosher salt on top, this makes the flavor really pop. Bake the cookie bars until they start to brown around the edges and then they’re done! No need to use a toothpick to pierce the center. You’ll see in my photo I have big squares, but when I served these to friends I actually cut these big squares into 4 smaller squares! They’re quite rich so I liked giving people the option to have just a bite or two at a time.
I used regular m&ms because I love the class look it give the dessert. But swapping for peanut/peanut butter or any of the fun festive seasonal flavors would be great for the holidays! Even just using the holiday colored classic m&ms would be the perfect treat to celebrate the holiday! Now I’m picturing these with Valentine’s m&ms and using white chocolate chips instead, so cute! I think Cupid would approve and demand a slice.
How to Cut Cookie Bars
Cutting cookie bars can seem a little daunting. Getting the perfect looking cookie squares requires 3 things, prep, a knife and a little patience. Prep your baking pan! Either lightly grease it or line it with parchment paper ( I don’t recommend foil because it can cause uneven baking)! If you line it with parchment paper and leave a little hanging over the edge of the pan you can lift up on the parchment to take the entire cookie “casserole” out of the pan. This will make it easier to cut. The knife. Your knife doesn’t need to be chef quality, but it still needs to be sharp and somewhat long. Don’t try to cut these with a butterknife! I also don’t use a serrated knife unless my bars have nuts in them. Patience. If you want your bars to look like mine, the M&M Cookie Bars need to be almost completely cooled. If you don’t wait for them to be cooled the chocolate will drag and bleed across your slices. (But these bars are super delicious warm!) But guess what, some recipes are easier to cut than others. This recipe cuts like a dream! So do my Sugar Cookie Bars!
So when do you cut cookie bars? Well, that depends how you will serve them. If you’re serving them cooled, then wait for them to cool completely to cut them. They will look their prettiest when cut cooled like in these photos. But if you want to dive into them warm from the oven (which is incredibly decadent), wait until the last possible moment to cut them. If you have leftovers, which I’m sure you won’t but IF you do… store them in an airtight container in the freezer.

Chocolate Chip M&M Cookie Bars
Need an easy dessert recipe to serve a crowd? These Chocolate Chip M&M Cookie Bars are perfect for any party! Just mix, bake, slice and done!
Ingredients
- 1 cup unsalted butter melted
- 1 cup brown sugar packed
- 3/4 cup sugar
- 2 large eggs room temperature
- 1 egg yolk room temperature
- 2 teaspoons vanilla extract
- 2 2/3 cups flour
- 2 teaspoons cornstarch
- 1/2 teaspoon baking powder
- 1 teaspoon salt
- 1 1/4 cups chocolate chips
- 1 1/4 cup M&M's
Instructions
-
Preheat oven to 350 degrees and prepare a 9X13 pan by lightly greasing it or lining it with parchment paper.
-
In a large bowl, combine butter (make sure it's not super hot or it will cook the eggs), brown sugar and sugar. Then add eggs, egg yolk and vanilla extract.
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In a separate bowl whisk together flour, cornstarch, baking powder and salt.
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Add the dry ingredients to the wet and just before it's all combined add in your chocolate chips and M&M's. Stir and then dump into your prepared pan and spread out evenly.
-
Bake for 25-30 minutes or until the edges start to turn golden brown. Let cool for 5-10 minutes and then serve warm or completely cooled.
I am going to do these for a wedding tomorrow! Instead of m&ms I will use cut up mini Hershey’s bars like mr Goodbar that I happen to have. Thanks for the timely recipe.
As an aside…have you figured out what gives the cookie shop cookies (that are so popular right now) the loft they have? They’re so thick! What’s the secret?
Do you mean the “lift” they have? I major trick to thick cookies comes from chilling or freezing the dough balls and also, when you make the doughballs make them taller than they are wide, so they’re not really round anymore, but they bake up TALL!
Thanks for recipe.
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I’ve been looking for the perfect bars, and these are it!
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Yum in my tum
Thank you for the yum food
Very nice recipe
yummy recipe
I am going to try them out ASAP.
Delicous! However, in my opinion, they do not require nearly as many chocolate chips as the recipe suggests. I prepared these for my class once, and I’ve been known as the class baker ever since! Every class party now requires me to bring them. These bars are well worth your time and effort!
Thank you very much for sharing this delicious and simple dish. I needed to use up some M&Ms that were left over from Christmas. I found yours when looking for a recipe. Everything about it appeals to me: the quantity, the simplicity of the ingredients, and the ease with which it may be prepared.
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The cookie dough is filled with M&M’s Minis milk chocolate candies. They’re ready-to-bake, which means you just have to break the 20 cookies apart, place them on a sheet, and bake them in the oven.
YUM!!!! I put cupcakes in a teacup and then put plastic wrap over the top to bring to school!
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Thanks for the great recipe, looks delicious!
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This recipe sounded great but did not turn out for me. I used parchment in a 9×13 pan which was great for lifting the bars out to check on them. Unfortunately, they were completely RAW in the middle after 30 mins in the oven, despite browning nicely on the top and edges. I put them back in for another 10 mins at 425 and thought they were done, but it was still raw on the bottom. Very disappointed 🙁
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