A spooky twist on the classic Scottish tray bake. Mummy Mars Bar Slices are sure to please monsters of any age!


Last Halloween I shared a recipe for Monster Rice Krispy Squares, which I’ve been making since my kids were just wee. This year, I again wanted to share something spooky and equally as tasty. After a bit of brainstorming, I came up with Mummy Mars Bar Slices.
Taking inspiration from our much-loved Mars Bar Slice recipe, I used the same formula for the base, whilst adding a Halloween inspired spooky finish.
Think of them as sweet Scottish treat to add to your spooky-season baking repertoire.
You make them the same way you would any good Mars Bar Slice. Start by melting your Mars Bars & butter, before adding the rice crispies, to make that iconic crispy but chewy base.
Unlike a traditional Mars Bar Cake, we then use white chocolate as the topping. And instead of spreading an even layer, you want to drizzle it on top to look like a Mummies bandages.
The edible candy eyes are almost enough to bring these Mummies back from the grave. Alive or not, they are a sweet treat the whole family will love.

Ingredients:
Butter or Margarine
Either will do and it’s personal preference to which you choose. The butter/margarine helps thin out the Mars Bars whilst melting, and stops them from becoming overly claggy.
Mars Bars
An essential ingredients in any Mars Bar Slice! Whatever size Mars Bar you use, just make sure they come to the total weight listed in the recipe.
Rice Krispies
They can be branded or store-own rice crispies, it doesn’t matter at all. They – along with the melted Mars Bars and butter/margarine – are what makes up the bulk of this Mars Bar Slice. The perfect combination of sweetness, sticky caramelly-nougat and rice crispies crunch.
White Chocolate
To transfer these into a Halloween Mars Bar Slice, we use a drizzling of melted white chocolate, to create the look of bandages. Simple but spookily effective!
Edible Eyes
You can now pick up a pack of edible candy eyes in most big supermarkets – and they are ideal for these Mummy Mars Bar Slices, as well as our Monster Rice Krispy Squares. But if you are struggling to get your hands on some, you could use a couple of chocolate chips as eyes instead.

Granny's Top Tips
• When it comes to melting your Mars Bars, you’ll never have a completely smooth mixture, as the nougat doesn’t melt in the same way as the chocolate & caramel. You can break it up a little with the back of your spoon/spatula but don’t worry too much, as it will mix through your rice crispies just fine.
• When it comes to drizzling your white chocolate, you can simply do this by drizzling it with a spoon. Or, if you prefer a neater finish, you can pop your chocolate into a dispoable piping bag and pipe it on.
• If you can’t get your hands on some edible eyes, simply use some chocoalte chips for eyes.

Love this? Try this:

Mummy Mars Bar Slices
Ingredients
- 115 g Butter or Margarine
- 230 g Mars Bars (roughly chopped)
- 130 g Rice Crispies
- 150 g White Chocolate
- 24 Edible Eyes
Instructions
- Line a 11x7 inch baking tray with some greaseproof paper and set aside.
- In a large bowl, melt the butter/margarine and Mars Bars over a bain marie or in short bursts in a microwave.
- Add the rice crispies to the melted ingredients and mix well, ensuring all are coated.
- Tip into your prepared baking tray and push down with the back of a spoon, ensuring an even finish right into the corners. Leave to set in the fridge for at least 2 hours.
- Once set, cut your Mars Bar Slice into your desired size and place on a fresh piece of greaseproof paper, with a little space between each.
- Melt the white chocolate over a bain marie, or in short bursts in the microwave. Allow the chocolate to cool a little before drizzling over your Mars Bar slices. Finish with a couple of edible eyes, stuck on with some excess chocolate.
- Allow the chocolate on your Mummy Mars Bar Slices to set for an hour or two, before enjoying.
Notes
- For full ingredient information and substitutions, please see the Ingredients Explanation above.
- For all my tips for success in this recipe, see Granny's Top Tips above.
- For free-from and vegan hacks, please see the Free-from & Vegan box below.
Free-from & Vegan
Gluten-free: To make these a gluten-free Mars Bar Slice, swap out the Mars Bars (which unfortunately aren’t gluten-free) for Butterm!lk Caramel Nougat Bars, and the rice crispies for a gluten-free alternative.
Be sure to double check your other ingredients for any unexpected allergens.
Nut-free: This is a nut-free Marsr Bar Slice recipe.
Be sure to double check your other ingredients for any unexpected allergens.
Egg-free: To make this an egg-free Mars Bar Slice recipe, simply swap out the Mars Bars for Butterm!lk Caramel Nougat Bars.
Be sure to double check your other ingredients for any unexpected allergens.
Dairy-free: To make this a dairy-free Mars Bar Slice recipe, simply use a dairy-free margarine, a vegan white chocolate and Butterm!lk Caramel Nougat Bars instead of Mars Bars.
Vegan: To make this a vegan Mars Bar Slice, simply follow the dairy-free hacks above.
