Cadbury Caramilk Custard Slice – Thermomix

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Just imagine a block of Caramilk chocolate and everyone’s favourite Custard Slice had a love child. The resulting dessert would be this amazing Caramilk Custard Slice.

Cadbury Caramilk chocolate has a bit of a cult following amongst chocoholics at the moment. A fellow Thermomix enthusiast came across this recipe on “Australia’s Best Recipes” website.  She sent out a message for a Thermomix conversion to be written. I couldn’t resist giving it a go.

I promise this is a “drop dead, simple” recipe to make. The custard slice is “no-bake” and sandwiched between two Arnott’s Lattice Slice biscuits. It would be a fabulous recipe to make with the kids.

Substitute Ingredients

In some areas, Arnotts Lattice biscuits are no longer available. If you have trouble finding this product simply swap them for SAO biscuits. It won’t make any difference to the recipe results.

Original Caramilk Custard Slice Recipe

The original recipe used just one block of Cadbury Caramilk Chocolate. Half was used in the filling and half in the ganache.

When I went to make the original ganache topping I found that it didn’t set. Those followers who were watching me on Facebook live would have seen me waiting for the ganache to thicken enough for me to pour over the slice. Basically, it never achieved a useful consistency. The recipe had too much cream. 

So this meant I needed to discard the mixture… in my belly and start again. I decided to use my regular ganache recipe and substituted Caramilk Chocolate. Just to make sure there was enough topping to cover the slice I increased the volume of the ganache slightly.  The adjustment ensured coverage of the chocolatey goodness over all the squares.

Landscape image of two Cadbury Caramilk Custard Slice on a floral tablecloth

…More Slices

I love desserts! Have you seen these delicious treats?

Apple Slice on a white background with floral teacup

Apple Slice with Streusel Topping

Close up of chocolate mint brownies on a floral plate

Peppermint Crisp Chocolate Brownie

Square image of lemon slice with a flower vase behind on white backgraound

Lemon Delicious


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Landscape image of two Cadbury Caramilk Slices on a floral tablecloth

Caramilk Custard Slice Thermomix

Julie Carlyle
Just imagine a block of Caramilk chocolate and everyone's favourite Custard Slice had a love child. The resulting dessert would be this amazing Caramilk Custard Slice. #Thermomix #CustardSlice #caramilk
5 from 10 votes
Prep Time 5 mins
Cook Time 10 mins
Refrigeration 1 hr
Course Dessert, Snack
Cuisine American, Australian, English
Servings 9 Slices
Calories 375 kcal



  • 200 g Lattice Biscuit Arnott's or Sao Biscuits
  • 90 g Caramilk Chocolate Cadbury Caramilk broken into pieces
  • 150 g milk
  • 475 g cream pouring cream
  • 100 g Instant Vanilla Pudding Cottee's
  • 22 g custard powder

Caramilk Ganache

  • 120 g Caramilk Chocolate Cadbury broken into pieces
  • 50 g cream pouring cream



  • Line a square cake tin with baking paper. Min Size 18cm square
  • Arrange 9 Lattice biscuits glaze side down on the paper in a square.
    200 g Lattice Biscuit

Caramilk Filling

  • Place 90g Caramilk chocolate in TM Bowl. Grate 4 sec/Speed 9.5
    90 g Caramilk Chocolate
  • Remove and reserve in a bowl.
  • Place remaining 120g Caramilk Chocolate in TM Bowl. Grate 4 sec/Speed 9.5
    120 g Caramilk Chocolate
  • Remove and reserve in an additional bowl.
  • Without cleaning the bowl add the milk to the TM Bowl. Heat 2min/70 degrees/Speed 1.
    150 g milk
  • Pour milk over the 90 grams of grated chocolate. Stir with a spoon to dissolve. Reserve.
  • Add butterfly whisk to TM Bowl.
  • Add 475g cream, vanilla pudding and custard powder to TM bowl. Whisk 1 min/Speed 4
    475 g cream, 100 g Instant Vanilla Pudding, 22 g custard powder
  • Scrape down the bowl and add the cooled chocolate, milk mixture.
  • Whisk 1 min/Speed 4.
  • Pour the custard filling over the arrange biscuit base and smooth.
  • Arrange another 9 lattice biscuits on top of the Caramilk custard slice.
  • Place the slice in the fridge to set.

Caramilk Ganache

  • Place 120g grated Caramilk Chocolate in the microwave. Heat in 30 sec intervals.
  • Stir the chocolate and repeat until smooth.
  • Add cream to the chocolate and stir.
    50 g cream
  • Pour the ganache over the slice immediately and smooth.
  • Return the Caramilk Custard Slice to the fridge until serving.



Keep slice refrigerated until serving.


Calories: 375kcalCarbohydrates: 29gProtein: 3gFat: 28gSaturated Fat: 17gCholesterol: 88mgSodium: 127mgPotassium: 148mgFiber: 1gSugar: 23gVitamin A: 851IUVitamin C: 1mgCalcium: 108mgIron: 1mg
Keyword Cadbury, Caramilk, Chocolate, Chocolate dessert, Custard, Dessert, slice, snack, Sweet snack
Tried this recipe?Let us know how it was!

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Thank you for stopping by,

Happy Cooking



16 thoughts on “Cadbury Caramilk Custard Slice – Thermomix”

  1. Peta MacLaughlin says:

    5 stars

  2. Steph Drifter says:

    5 stars
    Made these to take to a dinner party, and they stole the show! These are a massive win!

  3. Krystal says:

    5 stars
    OMG!! Where have you been all my life?! Amazing!!

  4. Anika Petersen says:

    5 stars
    Made these a couple of times now and they turn out perfect every time

  5. Natasha says:

    5 stars
    I love Caramilk so tried these and these were even better. Love it.

  6. Bec says:

    Hi, I can’t find lattice biscuits anywhere! Is there something I could use instead? So wanting to try this. It looks delicious x

    1. Julie Carlyle says:

      Arnotts have since stopped producing Lattice biscuits, you can sub with sayos.
      Happy cooking

  7. Nicole a says:

    5 stars
    Just made this!! Soooo yum, thankyou!

    1. Julie Carlyle says:

      Hi Nicole
      I’m so pleased you enjoyed the slice!! It’s also one of my quilty pleasures 🙂

  8. Kate Livingstone says:

    5 stars
    So good with the Lattice biscuits base and top, great idea

  9. Erin Sinclair says:

    5 stars
    So easy to make and so yummy. Thanks

  10. Samara J says:

    5 stars
    Thank you for the recipe 😘

  11. Row Macrae says:

    Hi, what size square tin would be best? Thanks

    1. Julie Carlyle says:

      Hi Row
      You can use any tin larger than an 18cm Square (7inch)
      I didn’t have a square tin so I used a large rectangular roasting tray and just lined it with plastic wrap.
      Happy Cooking

  12. Louise says:

    5 stars
    Thanks so much for doing this!!! Love your work

    1. Julie Carlyle says:

      Thank you so much for your kind words Louise xx

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