This Mars Bar Slice (Milky Way Slice) makes a fun and easy treat that the whole family will love. It's perfect for packing in lunches, serving at morning teas or bake sales, or even gifting to friends and family.
Mars Bar Slice is a classic Australian recipe that is a favorite across the country, and it is easy to see why! It is chocolatey, caramelly, and crunchy. It is a no-bake recipe with 5 ingredients and 15 minutes of prep time!
With its simple recipe and irresistible taste, it's sure to become a family favorite in no time. Just be warned - once you take a bite, you might not be able to resist going back for seconds (or thirds, or fourths!)
Ingredient Notes
These notes are here to help make this recipe a success; they cover some but not all ingredients; for a complete ingredient list, check out the recipe card below.
Mars Bars: a popular chocolate bar with nougat and caramel enrobed in smooth chocolate. (See below for more information if you are reading in the US)
Butter: I used salted butter.
Rice Bubbles: Also known as Rice Krispies. You can use any puffed rice cereal.
Milk Chocolate: I like to use a bar of Cadbury chocolate for the topping. Cooking chocolate doesn't have the same creamy taste.
Vegetable Oil: Adding this to the melted chocolate helps to stop it from cracking when you cut the slice.
What is a Mars bar? Is it the same as a Milky Way?
If you grew up with Mars Bars and Milky Ways, this question will seem silly, but interestingly, the answer varies depending on your location. In countries outside of the US, a Milky Way refers to a chocolate bar composed of a soft choc-malt nougat coated in a layer of chocolate, while a Mars Bar features a firmer nougat base topped with caramel and then covered in smooth milk chocolate. However, a Milky Way in the US resembles what the rest of the world knows as a Mars Bar.
So US readers you will need to buy Milky Ways for this recipe.
Recipe Tips
We've tested this recipe at least 3 times to ensure it works well for you, have a look at our tips for getting the best dish you can!
- The size of chocolate bars is shrinking! The best way to ensure you have enough Mars bars is to look at the weight of the packets and add up how many you'll need. It probably won't be exact, so go for more rather than less. I generally use fun-sized bars as it is easy to get roughly the correct right.
- Buy a fresh box of puffed rice cereal; an opened packet won't have the same crunch.
- Melt the butter and Mars bars pieces over low heat; this stops them from catching on the bottom of the pan. Stir it frequently. It can sometimes look like it has separated, don't worry; remove it from the heat and stir it into the rice bubbles.
- Line the slice tray with baking/parchment paper with some overhang to make it easy to pull out the slice.
- This recipe uses a 28x 18cm/7" x 11" rectangle pan.
- When you put the mixture into the slice tin, push it down firmly to ensure that when you cut the slice, it doesn't crumble. I use a second tin to push it down.
- Leave the slice in the refrigerator for at least 3 hours. This ensures it is fully set and won't fall apart when cut.
- To cut nice neat slices: Remove the slice from the refrigerator for 5 minutes before cutting. Dip a sharp non-serrated knife into boiling water, dry it carefully, and cut your slice.
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Why You'll Love This Mars Bar Slice
- It is so easy to make.
- The kids can help make it.
- It is a sweet treat that everyone enjoys.
- It keeps well making it great for bake sales or gifting.
Recipe Adaptions
These are all just suggestions and things that have worked in our test kitchen, but it is your dinner, so adapt it to suit your family. That is the beauty of cooking; we can all create our own delicious treats.
- Swap out the chocolate top: Instead of milk chocolate, you can use dark chocolate, white chocolate, or one of our favorite twists is to use a caramilk bar.
- Extras: Add extra treats to the rice bubble mixture or the chocolate top. Mini marshmallows, crushed Maltesers, mini M&Ms, peanut butter chips, caramel chips, or crushed nuts are all great add-ins.
- Change the cereal: Go extra chocolatey and use coco pops instead of rice bubbles. Or use cornflakes for something different.
Enjoy x
For more Sweet Treats, try:
- Subway Style Chocolate Chip Cookies
- Sprinkle Cookies
- Fudgy Brownies
- French Palmier Cookies
- Chocolate Mousse Pots
If you make this Mars Bar Slice, please come back and comment. You can also tag me on social media.
Any questions about the recipe? Use the comments section below.
Get the Recipe
Mars Bar Slice
Ingredients
- 7 oz Mars bars , chopped (see note 1)
- ⅓ cup salted butter , chopped
- 3 cups puffed rice cereal (see note 2)
- 9 oz milk chocolate (see note 3)
- 1½ tablespoon vegetable oil
Instructions
- Line a 28x 18cm / 7" x 11" rectangle pan with baking/parchment paper.
- Combine the chopped Mars Bars and butter in a saucepan over low heat. Stir constantly until the mixture has melted. (see note 4)7 oz Mars bars⅓ cup salted butter
- Stir in the puffed rice cereal and press the mixture evenly into the lined tray. Push the mixture firmly to ensure the finished slice doesn't crumble.3 cups puffed rice cereal
- Put the milk chocolate and vegetable oil in a microwavable bowl. Microwave at 50% power for 3 minutes, stirring every 20-30 seconds until the mixture completely melts.9 oz milk chocolate1½ tablespoon vegetable oil
- Pour the melted chocolate evenly over the slice.
- Refrigerate for at least 3 hours until set solid.
- Use a hot, dry knife to cut your slice into even squares.
Notes
- Mars Bars are a popular chocolate bar with nougat and caramel enrobed in smooth chocolate. They are called Milky Ways in the US.
- The most common puffed rice cereals are Rice Bubbles or Rice Krispies, but you can use any puffed rice cereal.
- I like to use a bar of milk chocolate for the topping. Cooking chocolate doesn't have the same creamy taste.
- If your Mars bar and butter mixture seems to separate, don't worry; remove it from the heat, stir it well, and then add it to the puffed rice.
Nutrition
Nutrition is per serving
Dany says
The recipe came together easily and flavors really transported me back to my childhood.
The puffed rice cereal added nice texture to. I know these mars bar slice will become my new go-to recipe anytime I need to make something for a party.
Claire | Sprinkles and Sprouts says
Oh I am so happy Dany 🙂
It is a favorite in our house for sure!
Cx
Lena says
I'm so happy that I found a homemade Mars bar slice recipe for my children! They love any chocolates with puffed rice cereals in them. so when I was sure they'd love these. They did! They keep asking me for more now LoL! Thank you for sharing this recipe!
Claire | Sprinkles and Sprouts says
Oh I am so happy the kids loved it Lena, it is always a fav with my kids too!
Thanks for taking the time to come back and comment.
Cx