A slab of chocolate and caramel that arrives like a whispered promise — dense, glossy, and warm with the memory of toasted biscuit. The aroma of melted Mars bars and milk chocolate curls through the kitchen, inviting patience and small, careful motions. If you find yourself tempted by slices, you might also savor the contrasts in a Pistachio and Cranberry Marshmallow Slice.
Why make this recipe
This Mars Bar Slice is the kind of confection that asks for only a little time and rewards you with the kind of nostalgia that melts on the tongue — buttery biscuit crumbs, pillowy condensed milk, and ribbons of caramel-rich Mars. It is both a celebration and a quiet ritual, ideal when you want a treat that is as much about texture as it is about sweetness. For those who love indulgent yet uncomplicated bars, it sits comfortably beside more textured loaves like the Biscoff Marshmallow Loaf.
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 them into squares to serve.
How to serve Mars Bar Slice
Serve chilled, but let each piece sit at room temperature for a few minutes so the chocolate softens and the caramel sighs slightly beneath the surface. A thin dusting of cocoa or a scattering of flaky sea salt will sharpen the sweetness. For a lighter counterpoint on the platter, pair it with delicate treats such as Cannoli Cheesecake Bars — the contrast of cream and caramel is irresistible.
How to store Mars Bar Slice
Keep the slice covered in an airtight container in the refrigerator for up to one week. For longer keeping, freeze individual squares separated by baking paper in a freezer-safe container for up to one month; thaw in the fridge before serving to preserve texture and flavor.
Tips to make Mars Bar Slice
- Chop the Mars bars small so they melt uniformly and create a silky caramel base.
- Use a hot, dry knife for neat slices: warm the blade under hot water, dry it, then slice in one confident motion.
- Press the base firmly and evenly into the pan to avoid crumbling when you cut the bars.
- If your chocolate topping seizes, stir in a teaspoon of vegetable oil or a small splash of warm cream to restore sheen.
Variations (if any)
- Nutty: Fold in 1/2 cup toasted hazelnuts or chopped almonds for crunch.
- Crisp: Add 1/2 cup Rice Bubbles or toasted oats to the biscuit base for a lighter, airy bite.
- Dark: Use dark chocolate for the topping to balance the condensed milk’s sweetness with a bitter edge.
FAQs
Q: Can I use a different biscuit if I can’t find scotch fingers?
A: Yes — digestives, graham crackers, or shortbread all work. The key is a fine crumb that binds well with the condensed milk mixture.
Q: Do I have to refrigerate the slice overnight?
A: Overnight chilling gives the slice its clean sliceability and lets the flavors meld; a minimum of 4–6 hours will set it, but longer is better.
Q: Can I make this slice nut-free and allergy-friendly?
A: Yes — omit any added nuts and check your chocolate and Mars bars for cross-contamination warnings. Use certified allergy-friendly chocolate if needed.
Q: How do I get a perfectly smooth chocolate topping?
A: Melt gently over medium-low heat or in short bursts in the microwave, stirring frequently. Adding a teaspoon of neutral oil can enhance shine.
Q: Is there a dairy-free version?
A: For dairy-free, seek out vegan caramel bars and dairy-free condensed milk alternatives, and use dairy-free chocolate; results will be slightly different in texture but still delicious.
Conclusion
For a classic reference and another take on this indulgent treat, you can explore a guide at Mars Bar Slice – VJ Cooks, which captures the comforting simplicity of this bar. If you’re curious about a variation that includes crunchy cereal elements, see the recipe inspiration at Kellogg’s® Rice Bubbles® Mars® Bar Slice | Recipe.
Baking asks for slow hands and patient hearts; the smallest acts — melting, pressing, waiting — yield the largest comforts.
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 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 the chocolate mixture over the Weet-Bix mixture. Stir well to combine. Press mixture into the prepared pan. 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 chocolate over slice and smooth the 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 them into squares to serve.