Thermomix Chocolate Weetbix Slice -No Bake


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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5 from 1 vote
Landscape image chocolate slice on ceramic blue plate and white wood background
Thermomix Chocolate Weetbix Slice
Prep Time
10 mins
Total Time
10 mins

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.

Course: Lunchbox, Slice, Snack
Cuisine: Australian
Keyword: Chocolate Slice, Healthy snack, Kids Snack, Lunchbox, Thermomix Slice
Servings: 48 pieces
Calories: 131 kcal
Author: Julie Carlyle
  • 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
  1. Place Weetbix in TM bowl. Blitz 4 sec/Speed 7.

  2. Remove Weetbix from the TM and reserve for later.

  3. Without cleaning the bowl add butter, vanilla, cocoa powder and condensed milk. Heat 4 min/Varoma/Speed 2. 

  4. Add coconut, choc bits, seed and sultana mix and reserve Weetbix. Combine 1 min/Speed 2.5 (Reverse Blade).

  5. Line a slice tray with aluminium foil.

  6. Place the slice mixture into the tray and press down firmly. Refrigerate.

  1. Add the chocolate and cream to a clean glass dish. Microwave in 20-second bursts until melted, stirring in between.

  2. Pour the chocolate topping over the slice. Refrigerate for one hour or until required.

Recipe Notes

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. 

Nutrition Facts
Thermomix Chocolate Weetbix Slice
Amount Per Serving
Calories 131 Calories from Fat 72
% Daily Value*
Fat 8g12%
Saturated Fat 4g20%
Cholesterol 10mg3%
Sodium 68mg3%
Potassium 129mg4%
Carbohydrates 12g4%
Fiber 2g8%
Sugar 7g8%
Protein 2g4%
Vitamin A 245IU5%
Vitamin C 0.2mg0%
Calcium 25mg3%
Iron 2.5mg14%
* Percent Daily Values are based on a 2000 calorie diet.

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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Zucchini Slice

Thermomix LCM Bars

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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

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

  1. 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. What a great idea!!

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