Ultimate Mars Bar Traybake Guide: Classic & Creative Variations

Few treats capture British nostalgia quite like the humble Mars Bar traybake. Sweet, chewy, chocolatey and incredibly easy to make — it’s the perfect no-bake dessert for busy cooks, kids’ parties, or whenever you need a crowd-pleasing slice of comfort.

In this guide, we’ll explore everything from the classic Mars Bar slice to modern creative variations — plus expert tips for getting that perfect chewy-gooey texture every time.

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Why Mars Bar Traybakes Are a British Favourite

The Mars Bar traybake became popular in home kitchens decades ago — mainly because it’s effortless, requires no oven, and always turns out delicious.

Made with melted Mars Bars, butter, and Rice Krispies, it has a nostalgic sweetness that reminds many of childhood bake sales and lunchbox treats.

And the best part? You can customise it endlessly — adding nuts, caramel, or even a hint of sea salt for a grown-up twist.

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The Classic Mars Bar Traybake Recipe

This is the original, foolproof version — soft, rich, and ridiculously easy.

Ingredients

• 4 standard Mars Bars (about 160g total)
• 100g unsalted butter
• 3 tbsp golden syrup
• 150g Rice Krispies (or similar puffed rice cereal)
• 200g milk chocolate (for the topping)

Method

1. Melt the base. In a saucepan over low heat, melt the butter, golden syrup, and chopped Mars Bars. Stir continuously until smooth.
2. Add the crunch. Remove from heat and stir in the Rice Krispies until evenly coated.
3. Press into a tin. Spoon the mixture into a lined traybake tin (20x20cm works well) and flatten gently.
4. Top with chocolate. Melt the milk chocolate in a heatproof bowl over simmering water, then pour over the base.
5. Chill. Refrigerate for about 1 hour, then slice into bars or squares.

👉 Pro tip: For extra chewiness, let it rest at room temperature for 10 minutes before cutting.

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Creative Mars Bar Traybake Variations

Once you’ve mastered the classic, it’s time to experiment!
Here are five creative ideas to elevate your traybake from simple to spectacular:

1. Salted Caramel Crunch

Add a pinch of sea salt to the melted mixture and swirl in a spoonful of caramel sauce before adding the topping.
Perfect for adults who love a sweet-salt contrast.

2. Peanut Butter Mars Slice

Mix two tablespoons of peanut butter into the melted Mars Bar base.
Top with melted milk chocolate and a drizzle of white chocolate for a stunning finish.

3. Rocky Road Mars Bars

Fold in mini marshmallows, raisins, and crushed digestives for a rocky road-style twist.
Use dark chocolate on top for extra richness.

4. Festive Mars Bar Slice

Add chopped dried cranberries and a handful of pistachios.
It’s perfect for Christmas gatherings and looks beautiful on the dessert table.

5. Healthy(ish) Mars Bar Slice

Swap half the butter for coconut oil and use puffed quinoa or oats instead of Rice Krispies.
Top with 70% dark chocolate — still indulgent, just a touch lighter.

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Tips for the Perfect Texture

• Low heat only: Melting Mars Bars too fast can cause the chocolate to seize — always melt slowly.
• Don’t over-press: Gently compact your mixture; pressing too hard makes it tough.
• Room-temperature cutting: Slice after 10 minutes out of the fridge for clean, neat edges.
• Storage: Keeps up to 5 days in an airtight container, or freeze for up to 3 months.

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Make It a Family Baking Day

Mars Bar traybakes are perfect for baking with children — no oven, no sharp tools, and lots of stirring and decorating fun.
Let little hands sprinkle toppings, drizzle chocolate, or cut fun shapes once cooled.

Check out our 🎂 Easy Chocolate Brownie Recipe for more easy, baking ideas.

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Beyond the Basics: Serving & Pairing

• Serve with: A glass of cold milk, a hot cup of tea, or a scoop of vanilla ice cream.
• Gift it: Wrap slices in parchment and ribbon for homemade gifts.
• For parties: Cut into bite-size squares and serve on a dessert board with brownies and flapjacks.

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Frequently Asked Questions

Can I use other chocolate bars instead of Mars Bars?
Yes! Try Milky Way, Galaxy, or even Crunchie bars for different textures and flavours.

Why did my traybake turn out hard?
You may have pressed the mixture too firmly or used high heat when melting — next time, go gently and don’t overcompact.

Can I make this gluten-free?
Absolutely. Just ensure your puffed rice cereal is certified gluten-free.

What’s the best chocolate for the topping?
Good-quality milk chocolate works best for the classic version, but dark or white chocolate can offer a creative contrast.

Can I freeze Mars Bar traybake?
Yes — slice it first, wrap in parchment, and freeze for up to 3 months. Defrost at room temperature before serving.