A slow, indulgent slice where caramel and chocolate meet biscuit; each cut releases a whisper of toasted oats and soft, molten Mars. The texture is a quiet dialogue — crunchy base, gooey heart, glossy crown. Make it when you want to fill the kitchen with a small, serious kind of joy.
Why make this recipe
Because few treats combine speed, nostalgia, and ceremony so well. The Mars Bar Slice asks little of your time but returns scenes: a warm saucepan of melting bars, the scent of condensed milk turning golden, and slices that sit like little slabs of comfort in the fridge. It is perfect for sharing, gifting, or keeping close with a quiet cup of tea.
How to make Mars Bar Slice
Ingredients:
- 250g packet scotch finger biscuits
- 8 Weet-Bix
- 395g can condensed milk
- 6 x 47g Mars bars, chopped
- 400g milk chocolate, chopped
Directions:
Line the base of a 3cm deep, 16cm x 26cm slice pan with baking paper, allowing the paper to extend 3cm over long sides. Place the biscuits and Weet-Bix in a food processor and process until fine breadcrumbs form. Transfer to a medium bowl. Place the condensed milk, Mars bars, and half the chocolate in a saucepan. Melt over medium-low heat, stirring often, for 3 minutes or until smooth and combined. Pour chocolate mixture over Weet-Bix mixture. Stir well to combine. Press mixture into prepared pan. Smooth top. Place the remaining chocolate in a microwave-safe bowl. Microwave, uncovered, on MEDIUM, stirring halfway, for 1 minute or until melted and smooth. Pour chocolate over slice. Smooth top. Place in the fridge overnight to set. Remove the slice from the fridge and set aside for 30 minutes. Use a hot knife to cut the into squares to serve.
How to serve Mars Bar Slice
Allow each square to warm slightly at room temperature — about 10–30 minutes depending on how chilled it is — so the edges yield and the chocolate becomes satiny to the touch. Serve on a simple white plate to let the buttery biscuit and caramel tones speak. Pair with black tea or a short espresso; the bitterness balances the sweetness and sharpens the slice’s caramel notes.
How to store Mars Bar Slice
Keep the slice chilled in an airtight container for up to 5 days. For longer keeping, freeze the cut squares in a single layer on a tray, then transfer to a freezer-safe bag for up to 2 months; thaw in the refrigerator overnight and bring to room temperature before serving for best texture.
Tips to make Mars Bar Slice
- Press the base firmly and evenly into the pan so each bite holds together without crumbling. A sheet of baking paper over the mixture helps you smooth it with flat pressure.
- Chop the Mars Bars fine so they melt quickly and integrate into the condensed milk for an even, glossy filling.
- When melting chocolate in the microwave, stir halfway and use short bursts to prevent seizing; a little warmth goes a long way with milk chocolate.
- Let the slice set overnight; the flavors deepen and the texture becomes perfectly sliceable.
- Warm a knife under hot water and wipe it dry between cuts for clean, glossy squares.
Variations (if any)
- Add a scattering of toasted hazelnuts or pecans to the base for an autumnal crunch.
- Stir 1 cup of Rice Bubbles into the base mixture for a lighter, crisped texture and playful snap.
- Swap the milk chocolate topping for dark chocolate if you prefer a less sweet finish, or swirl some white chocolate for an elegant marbled top.
FAQs
Q: Can I replace the Weet-Bix or scotch fingers with other biscuits?
A: Yes — digestive biscuits, graham crackers, or any firm tea biscuit will work. Replace Weet-Bix with an equal weight of crushed cereal if needed; the goal is a sturdy, absorbent base.
Q: My chocolate seized when melting — what went wrong?
A: Seizing happens when moisture touches melted chocolate or it’s heated too quickly. Use short microwave bursts and stir often; if it seizes, stir in a small amount of warm cream or a teaspoon of vegetable oil to loosen it.
Q: Can I make this slice nut-free and allergy-friendly?
A: Yes. Use nut-free biscuits and ensure all packaged ingredients are from nut-free facilities if allergens are a concern. Swap any additions (like toasted nuts) for seeds or extra Rice Bubbles.
Q: How do I get neat slices without smudging the chocolate top?
A: Chill overnight, then let the pan sit at room temperature for 30 minutes before cutting. Heat the knife under hot water, dry it, and make single decisive cuts, wiping between slices.
Q: Is it possible to halve the recipe?
A: Certainly. Use a smaller pan and halve each ingredient; keep an eye on chill time — a shallower slab may set a little quicker.
Conclusion
For the recipe’s origin and an alternate take with crunchy cereal, see this thoughtful Mars Bar Slice recipe at VJ Cooks, and for a variation that includes Rice Bubbles, consult the Kellogg’s rendition here: Kellogg’s Rice Bubbles® Mars® Bar Slice recipe.
Baking asks for patience; in the quiet wait, the ordinary becomes generous and the kitchen remembers why small rituals matter.
Mars Bar Slice
Ingredients
Method
- Line the base of a 3cm deep, 16cm x 26cm slice pan with baking paper, allowing the paper to extend 3cm over the long sides.
- Place the biscuits and Weet-Bix in a food processor and process until fine breadcrumbs form. Transfer to a medium bowl.
- Place the condensed milk, chopped Mars bars, and half of the chopped chocolate in a saucepan. Melt over medium-low heat, stirring often, for 3 minutes or until smooth and combined.
- Pour the chocolate mixture over the Weet-Bix mixture and stir well to combine.
- Press the mixture into the prepared pan and smooth the top.
- Place the remaining chocolate in a microwave-safe bowl. Microwave uncovered on medium, stirring halfway, for 1 minute or until melted and smooth.
- Pour the melted chocolate over the slice and smooth the top.
- Place in the fridge overnight to set.
- Remove the slice from the fridge and let it sit at room temperature for 30 minutes.
- Use a hot knife to cut into squares to serve.