Thermomix Chocolate Weetbix Slice -No Bake

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Weetbix slice is one of those classic lunchbox treats. I’ve revamped the recipe and made a Thermomix Chocolate Weetbix slice which is “no bake” and has some delicious modifications. I promise your kids will never guess how much goodness is in one square.

Thermomix chocolate weetbix slice on blue plate and white background

I try to provide my children with healthy, but delicious treats in their lunch box. I know that chocolate isn’t healthy and this slice includes other “sometimes” ingredients but its packed with 18 Weetbix, a cup of mixed seeds, sultanas and coconut, so it’s definitely not all bad. If you compare the slice to a bag of chips or some cookies this treat has many redeeming qualities.

Best of all, my family, and my taste testers loved the slice! Where’as some of the “raw, no refined sugar treats” I’ve tried I haven’t been so well received. So I think this is a happy compromise between nutrition and a treat slice.

Most of these ingredients you will probably already have in your pantry which is another big plus! I tend to make this slice when I find some “unloved” Weetbix that has been shoved to the back of the pantry. It’s also a great way of using up random, leftover nuts and seeds from other recipes. So feel free to substitute the pepita, sunflower and sultana mix for an equivalent weight of fruit and nuts.

Chocolate weetbix slice on a wooden chopping board

Step by Step Chocolate Weetbix Slice

# pictures showing the first 3 steps to make weetbix Slice

Step 4-6 of making Weetbix Slice

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Landscape image chocolate slice on ceramic blue plate and white wood background

Thermomix Chocolate Weetbix Slice

Julie Carlyle
Weetbix slice is one of those classic lunchbox treats.  I've revamped the recipe and made a Thermomix Chocolate Weetbix slice which is "no bake" and has some delicious modifications. I promise your kids will never guess how much goodness is in one square.
5 from 3 votes
Prep Time 10 mins
Total Time 10 mins
Course Lunchbox, Slice, Snack
Cuisine Australian
Servings 48 pieces
Calories 131 kcal


  • 265 g Weetbix approx 18
  • 160 g butter cut in cubes *not margarine
  • 1 tsp vanilla paste
  • 15 g Dutch process cocoa
  • 250 g condensed milk
  • 45 g shredded coconut *plus extra to garnish if desired
  • 200 g dark chocolate bits
  • 160 g Pepita, sunflower, pine nut and sultana seed blend

Ganache Topping

  • 200 g milk chocolate broken into cubes
  • 3 Tbs pouring cream


  • Place Weetbix in TM bowl. Blitz 4 sec/Speed 7.
  • Remove Weetbix from the TM and reserve for later.
  • Without cleaning the bowl add butter, vanilla, cocoa powder and condensed milk. Heat 4 min/Varoma/Speed 2. 
  • Add coconut, choc bits, seed and sultana mix and reserve Weetbix. Combine 1 min/Speed 2.5 (Reverse Blade).
  • Line a slice tray with aluminium foil.
  • Place the slice mixture into the tray and press down firmly. Refrigerate.


  • Add the chocolate and cream to a clean glass dish. Microwave in 20-second bursts until melted, stirring in between.
  • Pour the chocolate topping over the slice. Refrigerate for one hour or until required.


To make this a lighter healthier slice the chocolate topping can be reduced to just a drizzle of chocolate or omitted entirely.
Conventional Method
If you don't have a Thermomix you can still make this slice by hand.
Crush the Weetbix by hand into a large bowl.
In a smaller bowl add butter, condensed milk and vanilla. Place in the microwave for one minute and stir until melted and combine.
Add the cocoa, sultana and seed and chocolate bits to the Weetbix. Pour over the butter mixture.
Combine the ingredients with a wooden spoon.
Place the mixture into the prepared slice dish. Refrigerate. 


Calories: 131kcalCarbohydrates: 12gProtein: 2gFat: 8gSaturated Fat: 4gCholesterol: 10mgSodium: 68mgPotassium: 129mgFiber: 2gSugar: 7gVitamin A: 245IUVitamin C: 0.2mgCalcium: 25mgIron: 2.5mg
Keyword Chocolate Slice, Healthy snack, Kids Snack, Lunchbox, Thermomix Slice
Tried this recipe?Let us know how it was!

Thank you once again for stopping by and checking out the website. If you’re looking for more lunch box idea take a look at these;

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I’d love to know what you think if you make my Chocolate Weetbix Slice? Feel free to tell me what variations you’ve tried, oh and leave a rating too. Rating the recipes let others know if they should try it too. ?

Close up Chocolate Weetbix slice on blue gloss plate

5 thoughts on “Thermomix Chocolate Weetbix Slice -No Bake”

  1. Marilyn Newton says:

    5 stars
    Have just made this slice and the recipe is already marked with a large tick. Will certainly be making again.
    I only had “Trail Mix” in my pantry which was quite chunky, so I put it through “turbo” for 1 second just to break it all down a little. Perfect.

  2. Kerrie says:

    5 stars
    Easy and tasty recipe – stored in fridge but served at room temperature (better texture): Well worth the time to make / great for lunchboxes or with a cuppa.

    1. Julie Carlyle says:

      Awesome! So pleased you enjoyed the recipe.
      J xx

  3. Heidi Hyland says:

    5 stars
    Delicious – only had mint chocolate in the house so it tasted even better with a mint twist. Loving your recipes, thanks.

    1. Julie Carlyle says:

      What a great idea!!

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