An absolute classic and firm family favourite, you will love this easy and delicious version of a Chocolate Weetbix Slice
Posted March 18, 2014, Updated November 19, 2025
I have been making this for absolute years, a handwritten recipe from who knows where! I am sure these classic recipes are the same with a few variations. I assumed all weetbix slices were chocolate but no!
My friends make theirs without the added cocoa, but we love this version and think it’s the best.
This, along with my similar recipe for Cornflake Slice, are firm favourites for lunch box fillers, a simple slice all of the kids and adults enjoy. Over the years this has become the recipe that we teach the kids to make as it is just a matter of adding the wet ingredients to the dry.
When they are young we give them a hand with the melting of the butter but otherwise they love preparing and combining the ingredients.
A little tip I have when I have melted butter and vanilla in a recipe is to add the vanilla to the butter, this seems to help it infuse throughout the recipe, I love using vanilla essence and always use the Hansells flavoured one.
I know there are fancier versions out there but that is the flavour and smell we love! Not to mention it is reasonably priced!
You can also easily double this recipe, I often make it in my roasting dish, the cooking time only needs to be altered by a further 3-5 minutes, the slice is done when the outside of the slice is starting to harden, but overall it will still appear underdone, it will firm upon cooling.
For the icing I just use my basic chocolate icing recipe that I use for so many things from slices, cakes to Grandmas Afghans, another GREAT recipe to check out. It is the perfect smooth simple recipe that you will enjoy making time and time again.
I sometimes dust with coconut, you can also use sprinkles or leave it plain – either way it all tastes good! This does not need to set in the fridge, it can set overnight covered on the bench. Slice once set and enjoy. A great lunch box filler.
Onto the recipe for Chocolate Weetbix Slice!
Chocolate Weetbix Slice
Delicious and simple Chocolate Weetbix Slice, so easy to make and perfect filler for lunch boxes.
Ingredients
- 180g Butter, melted
- 1 teaspoon Vanilla Essence
- 3 Weetbix, crushed, 45 g
- 1 Cup finely Desiccated Coconut, 90 g
- 1 Cup Plain White Flour , 150 g
- ¾ Cup White Sugar, 160 g
- ¼ Cup Cocoa Powder, 25 g
- 1 teaspoon Baking Powder
- Optional - Add a ⅓ of a cup (60 g) of sultanas, diced walnuts or chocolate chips for added texture and flavour
Basic Chocolate Icing
- 1½ Cups Icing Sugar, 210 g
- 1 heaped Tablespoon Cocoa
- 5 g Butter, melted
- 1 teaspoon Vanilla Essence
- 2-3 Tablespoons Water
Instructions
- Preheat the oven to 180°C. Grease and line a 23 cm square tin with baking paper
- In a small bowl, melt the butter in the microwave in 30-second bursts, then stir in the vanilla and set aside.
- In a large bowl, add the crushed Weetbix, coconut, flour, sugar, cocoa, and baking powder and mix together well. Pour in the melted butter mixture and stir until well combined.
- Press the mixture firmly into the prepared tin and bake for 15 minutes, it will still appear soft in the middle at this stage and slightly more firm at the edges, that is perfect. Set it aside to cool slightly as you make the icing
- In a small ramekin melt 1 teaspoon of butter, stir in vanilla, and set aside.
- In a medium bowl sift the icing sugar and cocoa and stir well to combine.
- Pour the melted butter and vanilla into the bowl, then add in a teaspoon of water at a time, mixing well to remove lumps as you go, until it reaches a smooth, soft, spreadable consistency.
- Carefully spread the icing over the soft slice and sprinkle with desiccated coconut if desired.
- Cover and let set for at least 4 hours or overnight at room temperature, it will firm up further upon cooling.
- Slice into squares to serve, and store in an airtight container.
- Enjoy!
Nutrition Information:
Yield: 16 Serving Size: 1Amount Per Serving: Calories: 391Total Fat: 18gSaturated Fat: 7gUnsaturated Fat: 11gCholesterol: 25mgSodium: 189mgCarbohydrates: 53gFiber: 3gSugar: 36gProtein: 6g
JustAMumNZ.com, occasionally offers nutritional information for recipes contained on this site. This information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although justamumnz.com attempts to provide accurate nutritional information, these figures are only estimates.
I hope you love this classic, let me know in the comments below if you make it.
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Happy Baking!
Anna
Are you a Weetbix Slice fan? Then this lemon version from VJ Cooks looks simply delicious! Check it out here
Amy says
I made this recipe with gluten free weetbix and gf flour plus used olivani as my boy has lots of allergies and it turned out so well! Thank you!!!
justamumnz says
Brilliant! I’m so pleased to hear that.
Naomi says
Hi Im wondering if you could freeze this?
Judi Harding says
Even my 7 year old granddaughter can make this, and they love taking some home for their lunchboxes.
Stacy Lee Walters says
I have made this 3 times this week because my family absolutely love it!!!! The choc chips are a great addition 👌
Leanne says
Is this a crunchy sluce
Sandy says
Just made the chocolate weetbix slice , but crumbled, very hard to cut, don’t know what I did wrong. Been making weetbix slice for years without chocolate, could you please advise thanks Anna
Nancy says
Decided to try this recipe for a weetbix slice, picked it by the image, as it looked yummy. So pleased I selected this recipe, absolutely delicious. will be a repeat in my house. Who can stop at one piece!
Chris Wilding says
i just made this but have only just seen it has a teaspoon of baking powder … so will be interested to try a slice once iced ??
chris
justamumnz says
Let me know how you got on
Libby says
Hi there, can you freeze this slice? Thank you, Libby
Sally says
I’ve made a weetbix slice while living in Australia but mine wasn’t baked, which is why I liked it as too darn hot having to turn oven on
ShereeW says
Absolutely loved this stumbling across this recipe. Cooked it with my 4 year old, she really enjoyed crushing the weetbix (anything messy). So delicious, thank you! Took me back to my childhood.
Hine says
Thank you for this recipe. I’ve used it a couple of times now and it’s delish. Today I didn’t have enough coconut so I added oats and a bit more weetbix to get the right amount. Perfect with a cuppa.
Flo Banne says
Hi Anna, i love your super easy and yummy recipes. I have been following your blog for quite some time now and after many years i have started to proper note down recipes for future references(i dont trust my gadgets 🙂 ). Thank you so much. And today i tried weetbix slice and that turned out amazingly good!! If i could i will share the pic on facebook. Thanks again.
justamumnz says
I’m so pleased to hear you are enjoying the recipes and definitely share photos with me on FB when you bake them
AZH says
Love this one! I don’t wait overnight, usually firms quicker, love how the icing sinks into the base a little too.
justamumnz says
Great!
Althea Walker says
Great recipe! Took me back to my childhood and so easy to make. The kids love it!
Winnie says
Thanks for your sharing!
Elizabeth says
Hi there and thank you for my new-found inspiration. I look forward to your future posts and notifications.
Many thanks and kind regards
Elizabeth
Vicky says
Fab site,thanks.
justamumnz says
Thanks Vicky! 😀
claudia eva says
really delicous slice i made when my children were teenagers.
kate says
Really enjoy new recipes for kids.