Mars Bars Squares

4.99 from 91 votes
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Mars Bars Squares are a classic treat that is always a hit! Melted Mars Bars, ( or if you are in the USA, use Three Musketeers or any nougat bars that are like it) combined with butter and rice Krispies make the easiest and most delicious bar ever!

How to Make Mars Bars Squares

Sometimes simple can be simply the best, and it’s nice to forget the fancy desserts and go back to the basics. Mars Bar Squares are the basics.

What could be a greater start to a recipe than melting chocolate bars with butter? I can’t think of anything to be honest.

  1. Melt the butter and the Mars bars together in a pot.
  2. When that’s done, mix the Rice Krispies in with them, then transfer to a well-greased 9×9 pan. Pat into an even layer.
  3. Melt the chocolate and butter for the topping, then pour it on top. Cool in the fridge briefly to set the chocolate topping then cut into pieces and serve.

Mars Bars are Perfect for Parties!

These are my entire family’s go-to dessert when we are asked to bring a treat to a party, or whenever we have a family picnic!

How to Store Mars Bars Squares

Keep them in a cooler in the hot weather and they will stay perfect, and if you are at home simply store them on the counter.

For longer-term storage you can store them in the fridge, they do get a litter harder but that has never stopped us! Also, they are rarely stored that long as they tend to go quick!

Mars Bars Squares are THAT easy, you guys! It’s no wonder my Mom made these all the time when I was growing up – and she still does! Except she leaves the chocolate off the top and I keep telling her that it’s a crime against all things delicious to do that. They are good without the chocolate, but they are AMAZING with the chocolate topping.

Happy non-baking up these Mars Bars Squares!




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Mars Bars Squares

Classic Mars Bar squares, an old favorite for good reason, its chocolately, chewy and loaded with Mars Bar goodness!
4.99 from 91 votes
Prep Time
10 minutes
Cook Time
5 minutes
Total Time
15 minutes
Karlynn Johnston


  • 4 Mars Bars
  • 1/2 cup salted butter
  • 3 cups Rice Krispies


  • 1 cup chocolate chips, semi-sweet
  • 1/4 cup salted butter


  • Melt the Mars bars and butter together in a pot, then mix the Rice Krispies in with them, coating the cereal completely.
  • Transfer to a well greased 9×9 or 8×8 pan.Pat into an even layer.
  • Melt the chocolate and butter for the topping, stirring until smooth, then pour it on top.
  • Cool in the fridge briefly to set the topping, then cut into pieces and serve.
  • Store in a closed container at room temp for up to 4 days.

Recipe Video

Recipe Notes

  • If you don’t have Mars Bars, you can use Three Musketeers bars in the US!
  • ACTUAL calories and nutritional information is going to depend on what chocolate bar you use! These values are just approximate!

Nutrition Information

Calories: 194kcal, Carbohydrates: 15g, Protein: 1g, Fat: 14g, Saturated Fat: 8g, Cholesterol: 24mg, Sodium: 112mg, Potassium: 56mg, Fiber: 1g, Sugar: 9g, Vitamin A: 640IU, Vitamin C: 3.4mg, Calcium: 21mg, Iron: 2.6mg

All calories and info are based on a third party calculator and are only an estimate. Actual nutritional info will vary with brands used, your measuring methods, portion sizes and more.

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Karlynn Johnston

I’m a busy mom of two, wife & cookbook author who loves creating fast, fresh meals for my little family on the Canadian prairies. Karlynn Facts: I'm allergic to broccoli. I've never met a cocktail that I didn't like. I would rather burn down my house than clean it. Most of all, I love helping YOU get dinner ready because there's nothing more important than connecting with our loved ones around the dinner table!

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Reader Interactions

Comments & Recipe Tips Share a tip or comment!

  1. Gisele says

    Made this recipe tonight, had my husband sample a piece. He said it was amazing. I made a double batch because I knew a small pan wouldn’t be enough. This recipe is definitely a keeper.

  2. kirsty says

    Just use Milky Ways (not 3 musketeers as suggested, they don’t even have caramel in them) . LOVE this stuff, made it since a kid.

  3. Karen says

    Once the recipe is made, and cut into pieces, do you keep this in the fridge or on the counter? Can it be put in the freezer? Thanks

  4. Marilyn says

    I have been making these for years but I use cornflakes instead of Rice Krispies. They are always a hit! I’ll have to try Rice Krispies!

  5. Cleta says

    Are these full size candy bars or the smaller snack size?

  6. Di says

    My mother made these for us when we were children. Must be at least 60 years ago. Proper chocolate melted on top is best. We use either Cadbury or Galaxy.. They remain a special treat for us, our children and grandchildren

  7. Gisele says

    These are delicious and have been making them for years, instead of chocolate chips for the topping I use Aero chocolate bars. Family loves them.

  8. Antionette Shelby says

    Mars bars were discontinued in the US or at least I can’t find them and I live in Las Vegas now so I’m gonna try these with Snickers since I love nuts of all kinds.

  9. Joan says

    These look wonderful. i would like to make these for a bake sale. How ling do you think they would keep?
    Thanks5 stars

  10. Lyla says

    Should the chocolate chips be milk chocolate or semi-sweet? Thanks!

  11. Kory says

    I just did what the directions said and they were great!5 stars

    • Zura says

      Once the mars bars and butter have we mix in the rice krispies straight away while the mixture is still hot? Or do we leave it to cool off slightly before mixing in the rice krispies? Thanks

  12. Rosaline Linhart says

    you can bring down the cost of making these by buying the Mars Bars at the Dollar store….

  13. Heather Averill says

    Mmm… I love these. Made them at Christmas. 🙂

    5 stars

  14. The Kitchen Magpie says

    Laura Van Scoyk-Myers Milky Way would be the closest bar to it..

  15. Krista Girvan says

    These are the best! My mother in law introduced me to them. I only make them at the holidays though or I’d eat them all the time! Lol

    5 stars

  16. Tiffany Kautz says

    My absolute favourite square- my grandma used to make this for us as kids, and I now make this for my own family…..and end up eating A LOT of it \U0001f601

    5 stars

  17. Laura Van Scoyk-Myers says

    I’m guessing it’s close to our Milky Way? Or is it more like snickers? I’m pretty sure I’ve had a Mars bar before but they were discontinued here awhile ago.

    • Cocapp says

      Yes. I prefer them that way. My grandkids say it’s to sweet with the frosting.

      5 stars

  18. RosemaryBarryTargett says

    Can you freeze those mars bars squares thanks.

  19. Rebecca Cooper says

    they had knockoff mars bars at the $store 🙂 2 bars for $.50. Guess what I just made!

  20. SherriH67 says

    Thank you for sharing this very delicious and oh so addicting recipe!

    5 stars

  21. Deb Hove Johnson says

    I have a similar recipe that calls for 8 milky way bars, 2 sticks of butter and rice krispies (same as in rice krispie treats recipe) in a 9×13 pan. Then a pkg of chocolate chips and stick of butter melted for topping. SO YUMMY but we call them triple angioplasty bars.

  22. Michelle Kehoe says

    the best square I ever put inside of my bewwy………. I <3 these!

  23. Lindsey B. says

    Thank you for this recipe! Someone at our old church used to make these all of the time for tea time and I’d lost the recipe.

    I think Milky Way bars are probably also a good substitute for Mars bars, if you can find them!

  24. Vanessa says

    I was wondering if I could substitute Crisco for butter (as I am out of butter)?

    • Karlynn says

      Ohh, I am going to say no. Crisco just isn’t the same as butter, especially in this recipe!

  25. Marilyn the nurse says

    Saw this recipe on the Stir by CafeMom but can not find Mars bars in our area. I can’t remember if they taste like Snickers? Could you suggest a substitute bar? Thank you!!!

    • Karlynn says

      Mars bars don’t have nuts in them…hmm. You know what? Three Musketeer bars are close, but no caramel in them. Snickers would work if you want peanuts in the squares…

  26. Kevin says

    My wife’s pregnant, so I can and will not show her this post.

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