This post may contain affiliate links. Please read our disclosure policy.

These M&M Chocolate Bars have layers of oats, a sweetened condensed milk and chocolate center topped with more oats and M&Ms.

We LOVE Baking with M&Ms – from M&M cookies to M&M cake mix cookie bars, M&M cookie cake– they’re the perfect addition to so many desserts.

M&M Chocolate Bars stacked on each other.

Our go-to Dessert

We make dessert all the time, but one of our go-to’s (along with our sheet cake and cookie bars) are these M&M Chocolate Bars. We love them because:

  • So Easy – So Yummy! They are so simple and delicious. Everyone asks for the recipe. They’re also great with ice cream.
  • The perfect treat to change up. Because of the M&Ms, we love to make this for different holidays using the different holiday candies.
  • Make Ahead. This treat can easily be made in advance which is great for busy days.

Even our local firefighters love this treat and request it each year!

How to Make M&M Chocolate Bars

  1. PREHEAT. Preheat the oven to 350.
  2. BASE. In a large bowl, mix oats, flour, brown sugar, salt and 1 cup softened butter with a spoon. Remove 1 cup of this mixture and set it aside. Press the remaining mixture into a greased 9×13 dish.
  3. CHOCOLATE LAYER. In a small pot, melt sweetened condensed milk, chocolate chips and 2 tablespoons of butter over low-medium heat. Stir constantly until chips are melted and everything is smooth.
  4. TOPPING. Pour this mixture over the oats and spread evenly. Sprinkle reserve oat mixture over the top along with the M&Ms.
  5. BAKE. Bake for about 25-30 minutes. Let cool for at least 15 minutes before cutting.
M&M Chocolate Bars Variations gallery.

more Variations

M&Ms now have so many different varieties and colors, that you can create custom M&M bars for every holiday.

  • Use Holiday M&Ms for different holidays.
  • Use Different flavors of M&Ms to change up the flavor (for example: Peanut Butter M&Ms – even add a few PB chips too!)
  • Add other toppings.
    • crushed Oreos
    • Toffee Bits
    • Other chocolate chips (white chocolate and butterscotch are great)
    • Reese’s Pieces
    • Sprinkles
M&M Chocolate Bars Recipe in baking pan.

Storing

  • To STORE these bars, just cover tightly with Saran wrap and place on the counter for up to 3 days. If needing to reheat, just do so in the microwave for about 15 seconds.
  • Once cooked and cooled, you can FREEZE these cookie bars by placing a freezer-safe Ziploc bag and freezing for up to 2 months.
  • Thaw overnight and REHEAT in the microwave.
M&M Chocolate Bars Recipe on plate

For more Bars:

5 from 76 votes

M&M Chocolate Bars Recipe

By: Lil’ Luna
These M&M Chocolate Bars have layers of oats, a sweetened condensed milk and chocolate center topped with more oats and M&Ms.
Servings: 15
Prep: 10 minutes
Cook: 25 minutes
Total: 35 minutes

Ingredients 

  • cups all-purpose flour
  • cups quick-cooking rolled oats
  • 1 cup packed light brown sugar
  • 1 teaspoon salt
  • 1 cup plus 2 tablespoons unsalted butter softened, divided
  • 1 (14-ounce) can sweetened condensed milk
  • 1 (11.5-ounce) bag milk chocolate chips
  • 1 cup plain M&M’s

Instructions 

  • Preheat the oven to 350 degrees F. Grease a 9-x-13-inch baking dish and set aside.
  • In a large bowl, mix flour, oats, brown sugar, salt and 1 cup butter with a spoon. Remove 1 cup of the mixture and set aside.
  • Press remaining mixture into the bottom of the prepared baking dish.
  • In a medium pot, combine condensed milk, chocolate chips and remaining 2 tablespoons butter over medium-low heat. Stir constantly until chips are melted and everything is mixed well.
  • Pour chocolate mixture over oat layer and spread evenly. Sprinkle reserved oat mixture over the chocolate.
  • Top with M&M’s and bake for 25–30 minutes. Let cool completely in the pan before cutting.

Video

Notes

Make Ahead: These bars can be stored, covered tightly with plastic wrap, on the counter for up to 3 days. You can reheat in the microwave for about 15 seconds before serving, if desired.
Variations: Easily change up these bars with different types of M&M’s, such as white chocolate or peanut butter M&M’s. This is not only a great way to change the flavor, but also to customize the bars for holidays by using the fun holiday-colored candies.

Nutrition

Serving: 1bar, Calories: 310kcal, Carbohydrates: 39g, Protein: 3g, Fat: 16g, Saturated Fat: 10g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 3g, Trans Fat: 1g, Cholesterol: 35mg, Sodium: 266mg, Potassium: 65mg, Fiber: 1g, Sugar: 23g, Vitamin A: 410IU, Vitamin C: 0.1mg, Calcium: 38mg, Iron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Dessert
Cuisine: American
Making this recipe? Tag us!
Share it with us on Instagram using the hashtag #lilluna, so we can see what you’re creating in the kitchen!

About Kristyn

My name is Kristyn and I’m the mom of SIX stinkin’ cute kids and the wife to my smokin’ hot hubby, Lo. My mom’s maiden name is Luna, and I’m one of the many crafty “Lil’ Lunas” in the fam. On this site I like to share all things creative - from recipes to home decor to gifts and home decor ideas. Welcome!

So Easy & So Yummy

Get my cookbook!

My new cookbook is the ultimate resource for feeding your friends and family with 200+ simple recipes including videos, tips & more!

Leave a comment

Your email address will not be published. Required fields are marked *

Recipe Rating




125 Comments

  1. 5 stars
    Can’t stop eating these!! So yuMmy! I had to send half the pan with my husband to work so that i WOULDN’T eat anymore. He told me that people were calling them “crack” bars becuase they were so Addicting! Lol will definitely be making these again! But only when i have lots of people coming over 😉 thanks for the recipe!

  2. These look great, but how big is a bag chocolate chips? They come in different size packets! What weight did you use?

    1. I don’t have to ounces in front of me, but it’s just the regular size bag. It’s not tiny, but it’s not the largest one. You can’t go wrong with chocolate chips, so It doesn’t have to be exact. It’s as little or as much as you like 🙂 Hope that helps!!

  3. I made these and added a layer of PB on top of the oat before the chocolate, then topped with mini Reese’s Pieces-delicious for a PB fan. I’ve made them both ways, and with the PB layer & M&Ms on top, anyway they are YUMMY!

  4. 5 stars
    I made these for a holiday party last weekend. I knew they would be amazing just by looking at the ingredients…. but they exceeded my expectations! They are SO good! I must say, a little bar goes a looooong way. They make a rich and dense bar. So easy to make, and a new party favorite. Thank you for sharing this recipe!

    1. SO glad you like them. They’re definitely one of my “go-to” recipes!! Always a hit with any crowd. 😉