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Weetbix Slice

Weetbix Slice is one of those slices that’s great to pop into lunch boxes or enjoy as a sneaky snack.

It’s also one that’ll quickly become a family favourite – if it’s not already.

weetbix slice

I don’t remember a time when my mum didn’t make this slice.

When I think of it, I can see it perched inside a Tupperware container from the 70s. But it didn’t stay there for long. It always disappeared quickly.

I’ve always loved it and here’s some evidence of that: a note from my much younger self to my mum, written on her recipe for Weetbix Slice.

“Mum I want to cook this.” 

weetbix slice

And, 30+ years later I’m still wanting to cook this!

Weetbix Slice: the ultimate “crib” food

My mum has another memory of this slice. She remembers it as the first slice my Nan Mac (Nana Ling’s daughter) made. She remembers Nan making it regularly for my Pop Mac’s “crib”.

“Crib” is Australian slang for a light meal or lunch eaten at work.

And this lovely memory of my Pop Mac going off to work, in the mines or on a farm, with some Weetbix Slice in his crib is just what I love about this slice.

It’s always been the comforting little treat that’s the perfect reward after a hard day’s work. It’s a slice that your family will love – and keep on making – for generations. 

weetbix slice tray

Weetbix Slice in the Air Fryer

You can also make this slice in an air fryer.

So whether you’re away in the caravan or your oven is busy with other things, you can still bake up a batch of this crowd-pleaser.

Included below are additional instructions for making this slice in the 3.2L Kmart Air Fryer.

weetbix slice in air fryer
weetbix slice made in an air fryer

Mum’s Weetbix Slice recipe

Keep scrolling for the tested and tweaked version.

weetbix slice recipe
weetbix slice

Weetbix Slice

An oldie but a goodie. You can't beat this classic Weetbix Slice, covered in chocolate icing.
4.75 from 12 votes
Print Pin Rate
Course: Dessert
Cuisine: Australian
Keyword: weetbix slice
Prep Time: 15 minutes
Cook Time: 20 minutes
Total Time: 35 minutes
Servings: 24 pieces
Calories: 120kcal


  • 3 weetbix (or 55 grams of another similar wheat-based cereal)
  • 1/2 cup brown sugar
  • 1 cup SR flour
  • 1 cup desiccated coconut
  • 1 teaspoon cocoa
  • 125 grams butter


  • 1 1/2 cups icing sugar
  • 1 tablespoon cocoa
  • 1 tablespoon butter (15 grams)
  • 1-2 tablespoon boiling water


  • Pre-heat oven to moderate (I use 170 degrees celsius, fan-forced).
  • Grease a slice tin (approx 26 x 16 cm) and line with baking paper, leaving excess on the sides to lift out slice once cooked.
  • Crush weetbix into a bowl.
  • Add remaining dry ingredients to bowl and stir to combine.
  • Melt butter and add to dry ingredients. Mix well.
  • Press mixture into slice tin with hands and even the top surface using the back of a spoon.
  • Cook for 20 minutes.
  • Start preparing the icing a few minutes before the slice is ready to be removed from the oven. This slice is iced while hot from the oven.


  • Sift icing sugar and cocoa into a bowl.
  • Add 1 tablespoon of the boiling water to the butter and allow butter to melt.
  • Add melted butter mixture to icing sugar and mix well.
  • Add a little extra boiling water if necessary so the icing is soft enough to spread. Spread the icing over the slice while still hot.
  • Allow to cool completely before lifting from the tin using the baking paper and slicing into 24 pieces.

Airfryer Method

  • Using the 3.2L Kmart Air Fryer (or equivalent), use a circle of baking paper to line the basket so the paper reaches about one third to half way up the side of the basket.
    air fryer method for weetbix slice
  • Make the slice base according to the instructions above and pour mixture into air fryer basket.
  • Press down with your hands to make the base even and firm.
    air fryer method for weetbix slice
  • Smooth out the base further using the back of a spoon.
    weetbix slice in air fryer
  • Cook in the air fryer at 155 degrees celsius for 20 minutes.
    air fryer method for weetbix slice
  • Make up icing according to instructions above a few minutes before the base finishes cooking.
  • Once base is cooked, remove basket and pour icing over base while still hot.
    pouring icing over hot base
  • Place basket on bench so that it can cool evenly.
    allow icing to cool
  • Allow to cool completely before lifting slice from basket, lifting gently around the sides until it comes out of the basket in one piece.
  • Cut slice into pieces.
    weetbix slice made in an air fryer



Calories: 120kcal | Carbohydrates: 17g | Protein: 1g | Fat: 6g | Saturated Fat: 4g | Cholesterol: 12mg | Sodium: 44mg | Potassium: 27mg | Fiber: 1g | Sugar: 12g | Vitamin A: 145IU | Vitamin C: 1mg | Calcium: 6mg | Iron: 1mg
Recipe Rating

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Monday 2nd of November 2020

I made it today. The ingredients don't make alot for the base.


Tuesday 3rd of November 2020

Hi Tracey. Thanks for the review and comment. Did you use a 26 x 16 cm slice tin? The quantities should work well for this size tin. Libby :)

Zohra Aly

Wednesday 29th of April 2020

It looks yum, and I'm fasting so ....

I love the story behind it even more Libby, down to your cute hand-written note to your mum, and the Pop Mac crib story. I love hand-written recipe books- they're full of history in all the splodges and stains and hand-writing :)


Wednesday 29th of April 2020

Hi Zohra! Aww, thanks for your lovely comments. And you've reminded me of one of my favourite Sydney memories - the Lebanese sweets shops bustling each night during Ramadan and the wonderful special Ramadan desserts. Ramadan Mubarak.

Sandra Robbins

Wednesday 29th of April 2020

I remember eating this but my Mother never made it nor have I. It must have been at a friends house. Just reading the ingredients I can taste it and relive the memory. Must try this.


Wednesday 30th of December 2020

I use white sugar, 3 tblspns cocoa and 150g butter.


Wednesday 29th of April 2020

Hi Sandra. It's definitely one worth trying! It tastes just like it did when I was a kid :) Happy cooking!

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