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    Home » Recipes » Bars Brownies & Slices

    Mars Bar Slice | 10 Minute Recipe

    Modified: Oct 12, 2021 · Published: Sep 14, 2020 by Lucy · This post may contain affiliate links · 60 Comments

    Jump to Recipe
    A plate of 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. This crunchy chocolate caramel rice bubble slice recipe is always the most popular sweet treat in lunchboxes, at morning teas or bake sales.

    A plate of pieces of chocolate caramel rice bubble slice topped with milk chocolate

    It's no secret that no-bake slices hold a special place in my sweet-filled heart. Not only are they quick, easy and completely foolproof, they're also absolutely delicious!

    In my list of the top 5 most popular no-bake slice recipes, Mars Bar Slice is right up there - along with Lemon & Coconut Slice, Jelly Slice, Clinkers Slice and Peppermint Slice. 

    Mars Bar Slice Recipe

    With it's sweet and crunchy chocolate caramel rice bubble base and milk chocolate topping, it doesn't get any more delicious than this 10 minute recipe. 

    Forget any fancy equipment, all you need to make this slice is a microwave (or stovetop or Thermomix), a bowl and spoon. That's it!

    Let me tell you... if you love Mars Bars, then this slice is going to become your number 1 favourite recipe.

    Pieces of crunchy rice bubble slice made with chocolate and caramel and topped with milk chocolate on a plate

    What You Need

    *Please scroll to the recipe card at the bottom of the post for ingredient quantities and the full detailed method

    All you need is just 5 ingredients: 

    • butter - either unsalted or salted butter can be used
    • Mars Bars - are a chocolate bar produced by Mars that have layers of nougat and caramel, coated in milk chocolate
    • rice bubbles (or any puffed rice) - also known as rice krispies
    • golden syrup - is a popular baking ingredient in Australia. It is a light thick and sticky sweet treacle. If you can't find golden syrup in your supermarket, you can substitute it for corn syrup, honey or maple syrup.
    • milk chocolate - choose a good quality cooking chocolate as it will melt easily when heated. I generally use Cadbury or Nestle cooking chocolate or melts.
    • coconut oil or vegetable oil - this is an optional step but by adding coconut oil or vegetable oil to the melted chocolate, it will make the chocolate easier to cut once set.
    Bowls of rice krispies, chopped Mars bars, butter and golden syrup on a marble mat.

    10 Minute Recipe

    *Please scroll to the recipe card at the bottom of the post for ingredient quantities and the full detailed method

    Step 1 - Melt

    Chop the Mars Bars into small chunks, add the butter and golden syrup and melt in a heatproof bowl in the microwave on low heat (or on the stovetop/Thermomix).

    Chopped Mars Bars, butter and golden syrup in a white bowl.

    Note: The Mars Bars will not melt entirely - they will still be a little chunky which gives the slice a delicious texture and taste.

    Melted Mars Bars, butter and golden syrup in a white bowl.

    Step 2 - Mix

    Add the remaining chunks of Mars Bar pieces and the rice bubbles (rice krispies) and stir through with a metal spoon. The liquid will cover the rice bubbles making it a sticky mixture.

    Rice krispies and chopped Mars Bars in a white bowl.
    Sticky chocolate, caramel and rice bubble mixture in a white bowl.

    Step 3 - Press Into Tin

    The trick to the perfect Mars Bar slice is to press the mixture very firmly into a prepared baking paper lined rectangular slice tin (approximately 18cm x 22cm).

    I recommend either pressing the mixture down with a round glass or placing a tin of the same size on top and pressing down firmly until there's no loose rice bubbles remaining.

    Chocolate rice bubble slice mixture pressed into a baking paper lined rectangular tin.

    Step 4 - Add The Melted Chocolate

    You can melt the chocolate in the microwave or on the stovetop (or in a Thermomix).

    I recommend using cooking chocolate or chocolate baking melts as they melt easier.

    See my tips for melting chocolate in the microwave here.

    Melted milk chocolate being poured on top of a chocolate rice bubble base.

    Step 5 - Refrigerate

    It's important to allow the slice to set in the fridge before attempting to cut it.

    If time allows, it's best to leave it in the fridge overnight before cutting. If you're pushed for time, refrigerate for at least 3-4 hours.

    Melted chocolate spread over a no-bake chocolate, caramel and rice bubble slice in a baking tin.

    Recipe Tips

    • You can melt the butter, golden syrup and Mars Bars in the microwave, on the stove-top or in a Thermomix.
    • Make sure you use a fresh box of rice bubbles or rice krispies - this will ensure your slice is crispy and crunchy!
    • The Mars Bars will not melt completely but will remain in small chunks - this is fine and gives the slice it's classic chunky texture.
    • Press the mixture firmly into a greased and lined baking tin. The mixture needs to be pressed down very firmly so that it doesn't break apart when you cut it.
    • Adding coconut oil or vegetable oil to the milk chocolate will help it to stop from cracking when sliced. 
    • Leave in the fridge to set for a minimum of 3-4 hours (overnight is best). 
    • 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. 
    Pieces of chocolate slice made with Mars Bars and rice bubbles and topped with milk chocolate on a copper wire tray

    Storing Mars Bar 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. 

    More Mars Bar Recipes

    If you love Mars Bars (and who doesn't!) check out these delicious recipes:

    • The Ultimate No-Bake Mars Bar Cheesecake
    • Mars Bar Cheesecake Cups
    • Mars Bar Christmas Chocolate Crackles
    • Mars Bar & Malteser Slice
    • 3 Ingredient Mars Bar Fudge

    FAQ

    What can I substitute the golden syrup for?

    You can replace the golden syrup with corn syrup, honey or maple syrup. 

    What are Mars Bars?

    Mars Bars are a nougat and caramel bar covered in chocolate. They are made by Mars can be purchased from any supermarket. 

    How can I stop my slice from cracking and breaking when I cut it?

    Make sure the mixture has been very firmly pressed into the tin. Leave it to set in the fridge for a minimum of 3-4 hours (but overnight is best). Take the slice out of the fridge for 30 minutes before cutting. Use a small serrated knife to gently cut through the chocolate layer. Adding coconut oil or vegetable oil to the melted chocolate will also prevent cracking. 

    Are Mars Bars and Milky Ways the same?

    No they're not. Mars Bars have layers of caramel and nougat covered in milk chocolate. Milky Ways are similar but they don't have the caramel layer. You can substitute Mars Bars for Milky Ways or Moro bars in Mars Bar slice if you prefer (although my favourite version is definitely with Mars Bars!)

    Can I make Mars Bar slice in my Thermomix?

    Absolutely - refer to the recipe card below for the conventional and Thermomix methods. 

    Can you freeze Mars Slice slice?

    Yes! Cut the slice into pieces and then freeze in an airtight container for up to 3 months. To defrost, remove from the freezer and place in the fridge for an hour or until defrosted. If you prefer, you can even eat it directly from the freezer for a delicious crunchy, cold summer treat!

    Can you add marshmallows to Mars Bar slice?

    I love adding mini marshmallows to my Mars Bar slice. Simply chop marshmallows into little pieces or use mini marshmallows and stir through at the same step as the rice bubbles (rice krispies). Make sure your marshmallows are small so that it's easy to cut your slice into pieces.

    WANT EVEN MORE DELICIOUS RECIPES? Subscribe to my newsletter or follow along on Facebook or Instagram. And if you love baking, then please come and join my Facebook cooking club group or subscribe to my YouTube channel. 

    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 73 votes
    Print Pin Rate
    Course: bars and slices
    Cuisine: American, Australian recipe, western
    Prep Time: 10 minutes minutes
    Chilling time: 4 hours hours
    Total Time: 4 hours hours 10 minutes minutes
    Servings: 20 serves
    Calories: 151kcal
    Author: Lucy - Bake Play Smile

    Ingredients

    • 75 g (⅓ cup) butter
    • 150 g Mars Bars chopped
    • 1 tbs (20g) golden syrup
    • 3 cups (90g) rice bubbles or any puffed rice
    • 250 g (1 ⅔ cups) milk chocolate
    • 1 tbs (20g) coconut oil or vegetable oil (optional)
    Prevent your screen from going dark

    Instructions

    Conventional Method

    • Grease and line a 18cm X 22cm rectangular slice tin with baking paper and set aside. 
    • Melt the butter, 100g (two thirds) 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 remaining 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 serrated knife.

    Thermomix Method

    • Grease and line a 18cm X 22cm rectangular slice tin with baking paper and set aside. 
    • Place 100g (two thirds) 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 serrated knife.

    Notes

    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. 
    Use a fresh box of rice bubbles or rice krispies - this will ensure your slice is crispy and crunchy!
    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. 
     

    Nutrition

    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!

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    Comments

    1. Lucyloo says

      September 05, 2024 at 1:25 pm

      5 stars
      Great recipe so easy in the thermo. I didn’t bother cleaning in between stages, just made sure I had got all the Rice Bubbles out. And thermo instructions don’t say where to add the oil but I just referred to the conventional method. Thanks!

      Reply
    2. Anna Youd says

      September 01, 2024 at 2:59 pm

      5 stars
      Tastes good

      Reply
    3. Gay says

      August 24, 2022 at 2:34 pm

      Very nice freezes well

      Reply
    4. Lee says

      August 19, 2022 at 5:30 pm

      5 stars
      This was so easy and delicious! I swapped out dark choc for the milk and next time I might double the base for a thicker slice. Yum

      Reply
      • Lucy says

        August 20, 2022 at 8:21 am

        Fantastic!

        Reply
    5. Jenny says

      April 23, 2022 at 8:53 pm

      Always make mine with dark chocolate doesn’t seem to be over sweet that way & sometimes drizzle white chocolate over it & swirl or fork to pattern, always a hit wherever it goes.

      Reply
      • Lucy says

        April 25, 2022 at 9:49 am

        Fantastic!

        Reply
    « Older Comments
    5 from 73 votes (70 ratings without comment)

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    I’m Lucy! A mum, a wife, a food blogger and a lover of all things to do with food! I love creating delicious, no-fuss Thermomix and conventional recipes the whole family will love. Classic baking favourites, lunch box snacks, quick and easy family dinners and more!

    More about me →

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