Food & Drink
Mars bar slice recipe

Mars bar slice recipe

Mars Bar Slice, or Mars Bar Traybake, is another of the classic cakes that you will see in cafes throughout Scotland. It’s a cake similar to Tiffin and Millionaire’s Shortbread. It’s also identical to Malteser Traybake and Mint Aero Traybake. We can’t help but grab a piece whenever we come across one. ).

We made it ourselves at home, as with many other delicious Scottish traybakes. This could have been a big mistake. We only did it because we realized how easy it was! We don’t need to go anywhere to enjoy a tasty Mars Bar Cake. Oops.

It means that you will be able to enjoy the delicious Mars Bar Slices with us.

What is a Mars Bar Slice?

Mars Bar Slices are as easy to make as they are delicious. You probably had one when you were a kid. Here’s a reminder in case you forgot what they were.

Mars Bar Slices are made by mixing Mars bars with butter, Rice Crispies, and Rice Krispies. A tray adds the mixture, then melted chocolate on top. Then it’s placed in the refrigerator to cool.

You were told they are simple. You might wonder why they are so popular. They are delicious and straightforward. Rice crispies give the Mars Bar its taste through their crunch, snap, crackle, and pop. The extra chocolate may be overkill, but it’s a great way to finish this sweet treat.

What is the Mars Bar Slice called?

While researching it, we discovered that the Mars Bar Slice has multiple names.

The humble Mars Bar Slice can also be found in other countries as:

Mars Bar Squares

Mars Bar Cakes

Mars Bar Crispy Cakes

Mars Bar Krispie Squares

Even Mars Bar Krispie Cakes are delicious!

Many names can call the same slice. You’ll love them no matter what you call them.

Why make a Mars Bar Slice

This recipe is easy to make and only requires four ingredients. It takes 20 minutes (or less if you have already made it several times and know what you are doing). Mars Bars, one of our favorite chocolate bars, are available everywhere.

This recipe is a winner! You can try a similar recipe with other chocolate bars. There are so many possibilities! Scran loves simple recipes that require few ingredients. Check out our Scottish Macaroons and No Bake Malteser Traybake.

Golden syrup – optional

If the mixture of chocolate and Mars bars is lumpy (is that a technical term ..?), You can add some golden syrup if your medicine is lumpy and claggy.

How to Make Mars Bar Slices – Step-by-step Method

Line a 20x20cm square pan with baking paper and grease it.

Cut the Mars Bars roughly into 1cm thick pieces. 1cm thick.

Stir frequently while heating the Mars Bars in a large pan on low-medium heat. It’s okay if the nougat portion of Mars Bars does not melt.

Pour the Rice Krispies into the pan and stir until the Mars Bar mixture is completely covered.

Pour the mixture into the tin. Smooth it with the back side of the spoon to create an even layer.

Melt chocolate in 30-second bursts in the microwave, stirring between each.

Pour the melted white chocolate over the Rice Krispie layer, and smooth the surface.

Place the tin into the refrigerator for 2 hours at least or overnight.

Allow the traybake to return to room temperature before cutting it to avoid cracking the chocolate layer.


We haven’t tried it with any other chocolate bars. It will work as long as the chocolate bar contains a mixture of caramel and nougat. Next, we plan to try Snickers Bars or Milky Ways!

What happens when the mars bar slices are crumbly

The slice should be solid and easily cut without crumbling. It’s possible that the crumbling is because the ingredients weren’t mixed together well enough or the piece wasn’t pressed firmly into the tin.

Can you melt the Mars bars in the microwave?

You can melt the Mars Bar butter mixture in the microwave. You can melt the Mars Bars in the microwave, but you should do it in short bursts. Stir frequently.

Do I need to add Golden Syrup?

We’ve tried without Golden Syrup, but some recipes ask for it. You can add two tablespoons of Golden Syrup if you have difficulty melting the Mars Bars with the butter.

How do I cut through the chocolate layer without it cracking?

Mars Bar Slice should be removed from the refrigerator about 30 minutes before cutting.

You can dip your knife in hot water to dry it between cuts.

Add a few teaspoons of coconut or vegetable oil when melting the chocolate to make it easier to slice.

Press down on the Rice Krispies and chocolate layers when cutting.

Use a smaller serrated knife instead of a large, flat-edged knife.

We hope you enjoy this recipe and that it returns you to a chocolatey childhood memory!

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