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.

Get the eBook via instant download and then save to your computer, tablet, phone or iBooks. If you’d prefer a hard copy, all of our eBooks print to an easy-to-read A4 size.

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Mars Bar Slice

Mars Bar Slice

This perfect Mars Bar Slice recipe is so simple and works out perfectly every single time. Conventional and Thermomix instructions included.
5 from 3 votes
Print Pin Rate
Course: sweet
Cuisine: Slices
Prep Time: 10 minutes
Chilling time: 1 hour
Total Time: 1 hour 10 minutes
Servings: 20 serves
Calories: 151kcal


  • 75 g butter
  • 150 g Mars Bars chopped
  • 1 tbs golden syrup
  • 3 cups 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 melt - that is fine!
  • Mix until the butter and golden syrup are smooth.
  • Stir in the rice bubbles and the third Mars Bar (chopped).
  • Press mixture 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.
  • Remove slice from the refrigerator about 1 hour 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 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).
  • Pour the melted chocolate over the slice and place back into the fridge to set.


Adding coconut oil or vegetable oil to the melted chocolate will help with spreading and slicing, however it is entirely optional. 


Calories: 151kcal | Carbohydrates: 15g | Protein: 1g | Fat: 11g | Saturated Fat: 7g | Cholesterol: 8mg | Sodium: 30mg | Potassium: 61mg | Fiber: 1g | Sugar: 11g | Vitamin A: 1.9% | Calcium: 0.6% | Iron: 3.5%
Did you try this recipe?Mention @BakePlaySmileBlog or tag #BakePlaySmile!

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

  1. Tracey says:

    Coming from the uk I was wondering if you can tell me how many grams is in a cup? Love the sound of the mars bar slice as it’s one of my favourite chocolate bars
    Oh & seeing as you like Turkish Delight you might want to try these – Turkish Dekight Rocky Roads

    100g butter, roughly chopped
    300g dark chocolate, broken into squares
    3 tbsp golden syrup
    140g rich tea biscuit, roughly crushed
    12 pink marshmallow, quartered (use scissors)
    2 x 55g bars Turkish delight, halved and sliced


    Gently melt the butter, chocolate and syrup in a pan over a low heat, stirring frequently until smooth, then cool for about 10 mins.
    Stir the biscuits and sweets into the pan until well mixed, then pour into a 17cm square tin lined with foil and spread the mixture to roughly level it. Chill until hard, then cut into fingers.

    1. Bake Play Smile says:

      Yum sounds delicious!! You might find this website helpful for converting ingredients:

  2. Lily says:

    Hello hello – me again – how long will it last in the fridge???

    1. Lucy Mathieson says:

      Hi again! Up to 5 days 🙂

  3. John Malcon says:

    Hello, Lucy!
    Thank you for the perfect recipe! I sent to my wife a link on your blog!

    1. Lucy Mathieson says:

      Thank you!!!

  4. Alicia says:

    Is this recipe suitable for freezing? I’d prefer not to but just wanted to check!

    1. Lucy Mathieson says:

      Hi Alicia, yes you can freeze this recipe. xx

  5. Maria says:

    im wondering ifi the owner ot thermobliss and bakeplaysmile are the sam, because i see that the recipe its exactly the same with the only difference the coconut oil in the chocolate

    1. Lucy Mathieson says:

      Hi Maria, I own half of ThermoBliss with my very good friend Lauren (who also owns a website called Create Bake Make). So yes!!! I’m both here and over at ThermoBliss!!!

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