This deliciously crispy Mars Bar Slice is made from 5 ingredients and takes 10 minutes to prepare. It's a no-bake recipe that makes an excellent lunchbox or after-school treat.
Although the Mars Bar Slice was first developed in Australia, it's now popular worldwide. Rice Krispies are combined with melted Mars Bars and butter to form a crunchy base, then topped with a smooth layer of chocolate. It's a match made in heaven!
If you love a chocolaty no-bake slice, check out my easy-to-make Weetbix Rum Balls, Hedgehog Slice and Maltesers Rocky Road. Also, this 3 ingredient White Chocolate Fudge is super easy to make.
Jump to:
What are Mars Bars?
Mars Bars are a sweet treat originating in England. They're made with nougat, caramel, and chocolate, then covered in milk chocolate. They're known for their sweet taste and soft texture.
Why You'll Love This Recipe
- A no-bake recipe with 5 simple ingredients.
- 10 minutes prep time.
- It keeps well in the fridge or freezer.
Recipe Ingredients
Note: The full quantities are shown in the recipe card below.
- Mars Bars - come in all shapes and sizes these days, depending on which country you live in. They also appear to have shrunk in size in recent years!
- Butter - use unsalted butter.
- Rice Krispies - called Rice Bubbles in the UK and the USA.
- Milk chocolate: Use baking chocolate melts. Excellent quality brands are Cadburys and Nestle. Also, refrain from using regular milk chocolate, as it won't set properly. You could use dark chocolate instead.
- Vegetable oil - add a little to the melted chocolate to prevent the topping from cracking.
How to Make Mars Bar Slice
Note: This is a summary of the instructions. The full ingredients and instructions are shown in the recipe card below.
- Line a square baking tin with baking paper, leaving a slight overhang on each side. The overhang makes lifting the slice out of the tin easy once it is set.
- Place the Mars Bars and butter in a saucepan and heat over medium heat.
- Stir the mixture constantly until melted.
- Place the Rice Krispies into a large mixing bowl and pour over the melted Mars Bars and butter mixture.
- Stir the mixture well until all the Rice Krispies are coated.
- Press the mixture into the prepared tin with the back of a spoon. Remember the corners! Transfer to the fridge to set for a couple of hours before making the chocolate topping.
Make the Chocolate Topping
Melt the chocolate in the microwave, stirring every 30 seconds (this ensures even melting). Once the chocolate melts, stir in the vegetable oil. If you don't have a microwave, you could use the bain-marie method of melting chocolate in a bowl over a saucepan. See instructions here.
Pour the chocolate over the base, level with a spoon, then transfer it back to the fridge to set for 2-3 hours.
Top Tip
Take the Mars Bar Slice out of the fridge 30 minutes before serving. Cut into squares or slices with a warm knife to prevent cracking.
Storage
Store the Mars Bar Slice in the fridge (covered) for up to a week. Store in the freezer for up to a month.
Common Questions
Yes, you can! Swap with the same quantity of Rice Krispies / Rice Bubbles.
Vegetable oil added to the melted chocolate helps the chocolate not break. Also, warming a sharp knife in hot water before cutting it helps.
More No-Bake Sweet Treats
WANT MORE DELICIOUSNESS? Subscribe to my newsletter where I send out new recipes once or twice a month.
📖 Recipe
Mars Bar Slice
Equipment
- 20cm (8") square baking tin.
Ingredients
Crispy Base
- 190 g Mars Bars, chopped into small pieces, note 1
- 75 g unsalted butter, plus extra for greasing
- 110 g Rice Krispies, also known as Rice Bubbles
Chocolate Topping
- 250 g milk melting chocolate, or dark chocolate (US: semi-sweet chocolate chips) note 2
- 1 tablespoon vegetable oil, this helps prevent the chocolate from cracking
Instructions
For the Base
- Grease and line the base of a 20cm (8") square baking tin with baking paper. Leave some overhang on each side for ease of removal.
- Melt the Mars Bars and butter in a saucepan on the stovetop over medium to high heat and constantly stir until melted. The mixture will be smooth and shiny.
- Place the Rice Krispies into a large bowl and pour the melted mixture over the top. Work quickly and stir together with a spoon until the Rice Krispies are fully coated.
- Press the mixture firmly into the baking tin and place it in the fridge to set for 2-3 hours.
For the Chocolate Topping
- Melt the chocolate in the microwave, stirring every 20-30 seconds (this ensures even melting). Stir in the vegetable oil once the chocolate melts. If you don't have a microwave, you could use the bain-marie method of melting chocolate in a bowl over a saucepan. See instructions here.
- Pour the chocolate over the base, level with a spoon, and transfer it back to the fridge to set for 2-3 hours or overnight.
To Cut and Serve
- Take the Mars Bar Slice out of the fridge 30 minutes before serving. Cut into squares or slices with a warm knife to help prevent the chocolate from cracking.
Comments
No Comments