Mars Bars Squares are a classic summertime ( ok, anytime) treat! Melted Mars Bars, butter and rice Krispies make the easiest and most delicious bar ever!

Mars Bars Squares
Mars Bars Squares

How to Make Mars Bars Squares

Sometimes simple can be simply the best. Returning to amazing tasting but completely bad for you treats can sometimes be so soul satisfying.

Sometimes it’s nice to forget the fancies and go back to the basics. Mars Bar Squares are the basics.

Basic tasty.

Basic melt in your mouth chocolate.

Basic takes a few minutes to make!

Basic get out of bed at 1 am because you remembered they are in the kitchen. These and a glass of milk at 1 am in your kitchen makes up for any kind of day you had.

Or more like sneaking into your sisters kitchen to eat them, since I made these in her place while visiting.

What could be a greater start to a recipe than melting chocolate bars with butter? I can’t think of anything to be honest. When that’s done, mix the Rice Krispies in with them, then transfer to a well greased 9×9 pan. Melt the chocolate and butter for the topping, then pour it on top. Cool in the fridge then cut into pieces and serve.

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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5 from 10 votes
Mars Bars Squares
Prep Time
10 mins
Cook Time
5 mins
Total Time
15 mins

Classic Mars Bar squares, an old favorite for good reason, its chocolately, chewy and loaded with Mars Bar goodness!

Course: Dessert
Cuisine: American
Keyword: mars bar squares
Servings: 16
Calories: 194 kcal
Author: Karlynn Johnston
  • 4 Mars Bars
  • 1/2 cup butter
  • 3 cups Rice Krispies
  • Topping:
  • 1 cup chocolate chips, semi-sweet
  • 1/4 cup butter or margarine
  1. Melt the Mars bars and butter together in a pot, then mix the Rice Krispies in with them, coating the cereal completely.

  2. Transfer to a well greased 9Ɨ9 or 8x8 pan.
  3. Melt the chocolate and butter for the topping, stirring until smooth, then pour it on top.
  4. Cool in the fridge then cut into pieces and serve.

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 Facts
Mars Bars Squares
Amount Per Serving
Calories 194 Calories from Fat 126
% Daily Value*
Total Fat 14g 22%
Saturated Fat 8g 40%
Cholesterol 24mg 8%
Sodium 112mg 5%
Potassium 56mg 2%
Total Carbohydrates 15g 5%
Dietary Fiber 1g 4%
Sugars 9g
Protein 1g 2%
Vitamin A 12.8%
Vitamin C 4.1%
Calcium 2.1%
Iron 14.3%
* Percent Daily Values are based on a 2000 calorie diet.

Hey guys, I'm Karlynn! Welcome to The Kitchen Magpie, my website full of family friendly recipes, cocktails & homesteading tales of chickens & cows from the family farm! Make sure to check out my bestselling cookbook, Flapper Pie & a Blue Prairie Sky ,stay tuned for info on my second cookbook!


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  2. 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.

  3. 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.

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

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

  7. Rosaline Linhart Reply

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

  8. The Kitchen Magpie Reply

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

  9. Krista Girvan Reply

    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

  10. Tiffany Kautz Reply

    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

  11. Laura Van Scoyk-Myers Reply

    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.

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

  12. Rebecca Cooper Reply

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

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

  14. 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.

  15. Michelle Kehoe Reply

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

  16. Lindsey B. Reply

    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!

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

  18. Marilyn the nurse Reply

    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!!!

    • 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…

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