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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.


  • 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


  • 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


  • 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.



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.


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
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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!

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Recipe Rating


  1. 5 stars
    These are so easy to make and even easier to eat (the entire pan if you are not careful). Highly recommend!

  2. 5 stars
    Absolutely one of my favorite recipe to make for the kids. They would gobble up the entire batch if I let them. So easy to make.

  3. 5 stars
    These are always gone quickly. So delicious, and quick fix for your chocolate cravings. I switch back and forth between milk chocolate and semi sweet.

  4. These look awesome! I’m baking treats to include in our free lunch summer program and I know the kids will love them! The question I have is if the chocolate layer solidifies or stays gooey. These need to be packed in the lunches to send home to the families we serve so gooey isn’t an option. Thanks so much for such yummy recipes! Can’t wait to hear from you!

    1. Oh how fun!! I’m so glad you are able to use this recipe for something like that. Yes, the chocolate solidifies a bit, but it’s a soft solid… if that makes sense. 😉 It solidifies enough so when it is cut into a bar, it keeps its shape and the chocolate doesn’t ooze out. You can also freeze the bars before which will help them stay solid and nice for packing into lunches. Best of luck!

  5. 5 stars
    Delicious!! Made these for my kids last night and they were a huge hit. Definitely will be making these more often. So good and easy.

    1. 5 stars
      Oh my goodness. These are so yummy. My entire family ate them up over the weekend and there were none left. Will definitely be making them again soon.