No bake Mars bar slice recipe - Grab Your Spork | (2024)

Warning this recipe is highly addictive! Proceed with caution… This ultra indulgent no bake Mars bar slice recipe is also dangerously tasty. The humble Mars bar slice has been a staple of Australian households for decades.

Do you love chocolate? Caramel? That memory of chocolate crackles at every birthday party you went to as a kid? Then this no bake Mars bar slice recipe is for you!

Mars bar slice is one of those recipes that has been around for years! In fact, the Mars bar first hit Australian shores in the late 1940’s, first being manufactured under licence by another company until Mars opened up their own manufacturing in Ballarat in 1979. No one really knows who created the original Mars bar slice, but one thing is for certain and that is its delicious. The ooey gooey melted mars bars, combined with rice bubbles and a chocolate icing set on top is not only a treat for the kiddies, it is also a treat for the adults!

If like me you’ve always wondered how to make Mars bar slice you will be pleased to know this recipe is so easy to make, requires only four ingredients and did I mention you don’t have to bake it? Perfect-o! This timeless favourite and crowd-pleasing treat is perfect for those time poor and perfect to make for parties or take along to functions. No doubt it will be a hit with all ages!

Simply melt the mars bars in a large pot with a little butter and add the rice bubbles. Filling a square tin with the mixture, top off with a simple Cadbury chocolate icing and allow to set in the fridge! Slice into bite sized pieces or a squares depending on your preference. Voila!

Note – it is encouraged you share the mars bar slice with friends, family or work colleagues otherwise you will end up eating it all if you have no control!

If you like sweet treats then check out these our recipes for chocolate mint fudge, passionfruit marshmallows, pecan slice, apple and rhubarb crumble, florentine biscuits or afghan biscuits.

No bake Mars bar slice recipe - Grab Your Spork | (1)No bake Mars bar slice recipe - Grab Your Spork | (2)No bake Mars bar slice recipe - Grab Your Spork | (3)No bake Mars bar slice recipe - Grab Your Spork | (4)No bake Mars bar slice recipe - Grab Your Spork | (5)No bake Mars bar slice recipe - Grab Your Spork | (6)

Perfect Mars bar slice tips

Like all baking practice and precision with measurement makes perfect! There are many slight variations but follow these tips for the best Mars Bar Slice recipe.

Because this is a four ingredient Mars bar slice and there it is a no-bake slice it is a straightforward process but following these three tips will ensure it turns out perfect every time.

Use quality ingredients

There are only four ingredients, so use the best. Cadbury milk chocolate, real Mars Bars (none of this Moro bar rubbish), Kellogg’s rice bubbles, and quality butter.

Whisk to ensure a super smooth melted mixture

When melting the butter, Mars Bars together over heat, the mixture can be clumpy. Use a whisk to stir the mixture at the end of the melting process for a super smooth result every time.

Use the back of a spoon for an even finish

After pressing the mixture into the tray, use the back of a spoon to flatten the slice evenly on top before putting in the refrigerator to set.

Mars bar slice recipe FAQs

Q. Why does it taste so good?

The combo of rice bubbles combined with melted Mars Bars and butter… all topped with a layer of chocolate creates the perfect combination of flavour and texture. It’s sweet, crunchy airy and soft all at once making it the perfect comfort food.

Q. How many Mars Bars do you need for the slice?

You need 195g of Mars bars which equates to roughly four 53g mars bars or 11 bite size mars bars depending on the region you live in. If you are a Mars Bar lover, it might pay to buy them on the day you plan to make the slice.

Q. How should you store Mars bar slice?

At room temperature is better than refrigeration when it comes to retaining the quality of the flavour. The best way to store them is to line an air tight container with kitchen paper, and place them on top, if you have two layers worth then add another sheet of baking paper in between before seeling the lid. However, if it is hot in your house then best store it in the fridge. It will last at least a week stored in an airtight container in the fridge.

Q. Can you freeze Mars Bar slice?

You could, and I imagine it would be okay for at least month. Because Mars bar slice is so damn tasty I can’t imagine ever needing to freeze it.

Q. How long does Mars Bar Slice last?

If it lasts more than a few days, then you obviously have more will power than us.

No bake Mars bar slice recipe instructions

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No bake Mars bar slice recipe

No bake Mars bar slice recipe - Grab Your Spork | (7)


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Mars bar slice recipe the ooey gooey melted mars bars, combined with rice bubbles and a chocolate icing set on top is not only a treat for the kiddies, and is also a treat for the adults!

Author: Grab Your Spork

Recipe type: Dessert

Cuisine: American

Serves: 20


  • 195g Mars bar chopped (approx. 11 bite sized Mars bars)
  • 75g butter
  • 3 cup rice bubbles
  • 200 g milk chocolate


  1. Line a square 16 inch baking tray with baking paper.
  2. Combine your chopped Mars Bars and butter in a saucepan. Stir constantly over low heat, do not boil. Stir until the mixture is smooth.
  3. Stir in your Rice Bubbles.
  4. Press your mixture evenly into your lined baking tray.
  5. Microwave your chocolate in a small bowl until melted. Use a low setting. Stir every 20-30 secs.
  6. Spread the chocolate nice and even over the slice mixture and refrigerate until set.

No bake Mars bar slice recipe - Grab Your Spork | (2024)


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