Perfect Mars Bar Slice (best ever!!!!)

This perfect Mars Bar Slice recipe is so simple and works out perfectly every single time. 10 minutes prep time, completely no-bake AND with conventional and Thermomix instructions. Watch the video to see how easy it really is!!

Mars Bar Slice

I’m not the kind of girl that will walk into a supermarket and buy a Mars Bar to eat (not that there is anything wrong with that, I just usually choose a Turkish Delight instead!). Add to that the fact that I never really eat a bowl of Rice Bubbles for breaky (I’m more of a muesli girl). BUT I do NOT ever stick my nose up at eating Mars Bar slice. Never ever. Scroll down to watch my video and you’ll see why…


So what is it about Mars Bar Slice that makes it sooooo darn good?

A) You don’t need many ingredients – which is great for people like me who even when armed with a grocery shopping list still somehow manage to forget things!

B) It’s super fast to make… I’m talking 10 minutes!! Perfect for when you have other important things to do like cook dinner, fold washing… and watch Netflix!

C) You don’t even need to turn on the oven (which means you can spend your electricity bill savings on shoes… done. done and DONE!).

D) It’s so easy that you could virtually make it with your eyes closed – go on, try it… I dare you!

Mars Bar Slice

But seriously, if you’ve never tried to make Mars Bar Slice before, you have no idea what you’re missing out on… it’s freaking AMAZING!!!

Mars Bar Slice

On a random side note, I saw a piece of Mars Bar Slice in a cafe on the weekend for $4.50… for one teensy piece! Two pieces would have paid for the ingredients to make a whole slice. Crazy stuff!!! And anyway, everything tastes better when it’s homemade, don’t you think?

Mars Bar Slice


For more easy slice recipes, check out our NO-BAKE BARS & SLICES EBOOK packed with 17 of our most popular recipes (available in both conventional and Thermomix versions) for just $10.00.

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Shop the conventional version here or the Thermomix version here




Mars Bar Slice

Mars Bar Slice

Everyone's favourite no-bake Mars Bar Slice recipe couldn't be easier to make... with just 5 ingredients and 10 minutes prep time.
5 from 3 votes
Print Pin Rate
Course: sweet
Cuisine: Slices
Prep Time: 10 minutes
Chilling time: 4 hours
Total Time: 4 hours 10 minutes
Servings: 20 serves
Calories: 151kcal


  • 75 g butter
  • 150 g Mars Bars chopped
  • 1 tbs golden syrup
  • 3 cups (90g) rice bubbles or any puffed rice
  • 250 g milk chocolate
  • 20 g coconut oil or vegetable oil (optional)


Conventional Method

  • Grease and line a 18X22cm rectangular slice tin with baking paper and set aside. 
  • Melt the butter, 100g of the Mars Bars and golden syrup on low heat in a saucepan (or in 30 second bursts in the microwave on 50% power). Please note: the Mars Bars will not completely melt. Mix until the butter and golden syrup are smooth.
  • Stir through the rice bubbles and the third Mars Bar (chopped).
  • Press mixture very firmly into the prepared tin. 
  • Place milk chocolate and coconut oil/vegetable oil in a heatproof bowl. Microwave on medium for 3 minutes, 50% power, or until just melted, stirring every 30 seconds with a metal spoon. Stir until smooth.
  • Spread over slice and refrigerate until firm (a minimum of 3-4 hours - or best overnight).
  • Remove slice from the refrigerator about 30 minutes before cutting into squares with a warm knife.

Thermomix Method

  • Grease and line a 18X22cm rectangular slice tin with baking paper and set aside. 
  • Place 100g of the chopped Mars Bars, butter and golden syrup into the Thermomix bowl. Melt on 60 degrees, Speed 2 for 3 minutes.
  • Add the rice bubbles and the remaining Mars Bar. Mix on Reverse, Speed 2, 15 seconds or until completely combined.
  • Press the mixture very firmly into the prepared tin.
  • Place the milk chocolate into a clean TM bowl. Melt on 50 degrees, Speed 3 for 2-3 minutes (scraping down the sides of the bowl occasionally).
  • Spread over slice and refrigerate until firm (a minimum of 3-4 hours - or best overnight).
  • Remove slice from the refrigerator about 30 minutes before cutting into squares with a warm knife.


Recipe Notes
Melting the butter, golden syrup and Mars Bars - you can melt the ingredients in the microwave, on the stove-top or in a Thermomix. Note: The Mars Bars will not melt completely but will still in small chunks – this is fine. 
Press the mixture VERY firmly into a greased and lined baking tin - The mixture needs to be pressed down very firmly so that it doesn’t break apart you you cut it.
Adding coconut oil or vegetable oil to the milk chocolate - will help it to stop from cracking when sliced. 
Setting time - Leave in the fridge to set for a minimum of 3-4 hours (overnight is best). 
Cutting the slice - Take the slice out of the fridge 30 minutes before cutting to allow the chocolate to soften slightly. Use a small serrated knife to cut through the chocolate layer and then through the rice bubbles layer. 
Storing the slice - Mars Bar Slice can be stored in an airtight container in the fridge for up to 1 week. It can also be frozen for up to 1 month. 
Golden syrup substitutions - You can replace the golden syrup with corn syrup, honey or maple syrup. 


Calories: 151kcal | Carbohydrates: 15g | Protein: 1g | Fat: 11g | Saturated Fat: 7g | Cholesterol: 8mg | Sodium: 30mg | Potassium: 61mg | Fiber: 1g | Sugar: 11g | Vitamin A: 95IU | Calcium: 6mg | Iron: 0.6mg
Did you try this recipe?Mention @BakePlaySmileBlog or tag #BakePlaySmile!

45 thoughts on “Perfect Mars Bar Slice (best ever!!!!)”

  1. Julia says:

    How long will this keep in the fridge?

    1. Lucy says:

      Hi Julia, up to 1 week xx

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