Slimming World Diet Coke Chocolate Cake

Now for as long as I can remember, I have always been a fan of Coca-Cola, but I never knew that you can cook with it and make some amazing recipes, this Slimming World Diet Coke Chocolate Cake (Low Syn) is just one of the amazing recipes I have.

Slimming World Diet Coke Chocolate Cake

Now if you think this cake is going to kill your healthy eating, then no, not at all.

I have managed to make some tweaks, so now the recipe is coming in at 9 syns per slice if you use Jordan’s Skinny Sweetener, otherwise, it is 10 syns per slice.

As this Slimming World Diet Coke Chocolate Cake would work for a celebration, it can be made for any occasion. One thing I am sure of is that people won’t know it is a healthy cake.

I am sure you have seen recipes all over the internet for low syn cakes, the will use scan bran or something else like that. Well, that is not a cake.

This is seriously the best cake that I have ever made on Slimming World and at only 9 syns, you can afford to have a treat and know that you are still on point.

Alternatively, if you are wanting a recipe for cupcakes, follow this recipe and put it into cupcake cases instead. It should make around 16 cupcakes, that would make 7 syns per cupcake.

Is Coca-Cola ok to drink on Slimming World?

Original Coca-Cola certainly is not ok to drink if you’re following Slimming World, however, Diet Coke and Coke Zero are perfectly fine, because they don’t contain sugar.

There are a number of low calorie drinks on the market, Pepsi Max, Diet Lemonade and even better, water. You can drink tea and coffee, you just have to remember how much milk you are using. 

Slimming World Diet Coke Recipes

I have to say I love all the diet coke recipes that can be done on slimming world.

If you love this recipe then you’ll love the diet cola chicken recipe as well. Diet coke slimming world recipes can be so easy as well, you can leave them on to simmer and they cook to perfection.

Take a look at this slimming world slow cooker diet coke gammon recipe, it’s only 2 syns as well!

I have a few other diet coke recipes in the pipeline as well so make sure you check them out if you fancy it.

If you want to make some other slimming world desserts, check out some other recipes here.

Slimming World Diet Coke Chocolate Cake Cost

This recipe has been updated, with a change to some ingredients.

As I’ve said before, who doesn’t love a nice chocolate cake? This is a cheap cake to make with the whole cake costing less than £2 for the whole cake. This is absolutely perfect for birthdays, events or just because. 

Making a cake from scratch is some much more rewarding than buying in the shop, you have control over what goes into the cake.

You can even get the kids involved to help, especially if they are not in school and you want to keep them busy with doing something.

Then as a reward, you can enjoy the cake without feeling guilty or it costing the earth. 

Recipe Cost Breakdown

*Prices correct as of December 2020

Flour (Self Raising)250g885 kcal£0.08
Cocoa Powder3 tbsp61 kcal£0.27
Egg2 medium262 kcal£0.20
Sunflower Spread150g633 kcal£0.24
Bicarbonate of Soda1 tsp8 kcal£0.01
Standard Sweetener20g79 kcal£0.10
Milk150ml75 kcal£0.14
Vanilla (extract)1 tsp12 kcal£0.22
Diet Coca Cola200 ml0 kcal£0.21
Milk Chocolate100 g522 kcal£0.30
Diet Coca Cola3 tbsp0 kcal£0.06
Milk3 tbsp37 kcal£0.07
2574 kcal£1.90
160 kcal£0.12

Diet Coke Chocolate Cake

Following a healthy eating plan can be tough, you do have cravings for foods that you know you shouldn’t be eating, I know I do.

So the way to combat this is by thinking smart and looking at ways of still having what you want, without the guilt and or having it affect your journey. My cravings are always for sweet things, so this cake is absolutely perfect for me. 

If you’re looking for a healthier cake for a birthday or an event, you can’t go wrong with a bit of chocolate. If you need an excuse to have cake, November 26th is National Cake Day. That means you should be eating cake then. 

I have played around with this recipe a couple of times now and this is the version that I am happy with.

Remember depending if you want a full cake or you want to make cupcakes, this recipe is perfect for both.

If you have tried this Slimming World Diet Coke Chocolate Cake, let me know your thoughts if you have changed the recipe, what did you do and how it turns out?

Slimming World Diet Coke Chocolate Cake Recipe

Slimming World Diet Coke Chocolate Cake (Low Syn)

Slimming World Diet Coke Chocolate Cake (Low Syn) Recipe

This is a chocolate cake but not as you know it, this is a next-level chocolate cake, made with diet coke, baked to perfection. This is one of my absolute favourite cakes that I love making.
Prep Time 15 mins
Cook Time 40 mins
Total Time 55 mins
Servings 12 Slices


  • 250 g Self Raising flour
  • 3 tsp Cocoa Powder
  • 1 tsp Bicarbonate of Soda
  • 150 g Sweetener
  • 150 g Low Fat Butter
  • 200 ml Diet Coke
  • 150 ml Milk
  • 2 Medium Eggs
  • 1 tsp Vanilla Extract
  • 100 g Milk Chocolate Break into pieces (You can use milk or dark chocolate)
  • 3 tbsp Diet Coke
  • 3 tbsp Milk


  • Preheat the oven to 180°C. Grease a 20.5cm loose-bottomed cake tin and line the base with baking paper.
  • In a mixing bowl, add all the ingredients together, mix well until all combined. The mixture will be very wet, don’t worry it is meant to be.
  • Pour the mixture into the cake tin. Bake for about 40 minutes, check with a skewer, leave in the oven if it needs more time.
  • Once cooked, remove from the oven. Leave to cool in the tin for about 15 minutes, then turn out onto a cooling rack.
  • For the frosting, add the Diet Coke and chocolate into a saucepan and heat up gentle until the chocolate has melted and the mixture is all combined.
  • Remove from mixture from the heat and stir in the milk. set.
  • Spoon the chocolate mixture over the top of the cake, allow to cool and serve.

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38 thoughts on “Slimming World Diet Coke Chocolate Cake”

  1. Haven’t tasted it but it looks ok☺
    My only problem was that the chocolate icing didn’t thicken when cool so didn’t sit on top of cake.
    Where do I post my picture?

    1. Share on the Matt’s cafe Facebook page. I will have a look at the icing and see if I can make is failsafe.

  2. Doreen Cooper

    Can I use caster sugar instead of sweetener, if so how much please.

  3. Looks really nice, be great to see a slimming world dessert with mint, maybe a mint brownie?

  4. In all of my life of living, I have never heard of let alone tried a cake made with diet coke. Super impressive. This is probably an incredibly popular cake among those who eat low carb, keto, and sugar-free. This looks fantastic.

  5. This looks amazing! I never thought of adding soda to making a cake. I think I am going to have to try it especially since I love chocolate.


    How do you get 4.5 syns a slice please I’m getting 9.5 syns. I’m doing it for a taster evening on Tuesday so need to be sure. Could you please reply asap.
    Kind regards

    1. The post does state that the cake is 9 syns a slice, however, if you make individual cupcakes, this is only 7 syns a cupcake.

  7. This look lovely but is it definitely 4.5 syns per slice? You also mention “now the recipe is coming in at 9 syns per slice if you use Jordan’s Skinny Sweetener, otherwise it is 10 syns per slice.”

    Could you clarify? Many thanks 🙂

    1. Have made the amendments, there have been a few changes since SW updated the syn values on certain products, the post was correct and there was a slight error in the recipe card which has now been fixed.

  8. Hey could you do this with Coke Zero rather than Diet Coke? Would it work the same?

  9. I have tried it today and as I only had the silver spoon Sweetener it would have required 2 full tubs to reach the advised 150g of Sweetener.
    I used 75g of caster sugar instead but will keep an eye out for the Jordans skinny Sweetener as that may be better. There is 5kcal in 20g of caster sugar so I’m hoping it will be a similar amount of syns. Looking forward to trying it when it comes out the oven. It has risen lots ?

    1. Did it work with caster sugar Helen? I’ve just made it with sweetener but I’m not a fan of the taste sweetener leaves behind, I don’t use it in anything usually.

  10. Hi Sue, I have checked the recipe several times, especially after the update to the syn values. It does work out as 4.5 syns a slice.

  11. Hi, thinking of trying this for a friends birthday- for the frosting, how much Diet Coke and milk (& which milk) is used please? 🙂

    1. The frosting is diet coke, milk and chocolate, nothing more. I have made the recipe card simpler to see what is needed for the frosting.

  12. Aileen Qumsieh

    Hi Matt
    I have made this cake a few times now and love it. I have made one change which is to use 0 syns Jordan’s skinny sweetener. I use vanilla flavour and about 4 tblsp which is sweet enough for me. This means a reduction of 10 syns! Win win!

    1. Absolutely love that idea. I need to get some Jordan’s Skinny sweetener and give it a try for sure!!

  13. Sally Williams

    Have taken this recipe and will try it over the weekend. Slimming World cakes never seem to rise . This cake looks yummy . Your cake to says 20.5 .my tin is 20cm hope this is going to be ok . I’ll save you my thoughts after I’ve cooked it.

  14. No not for me tried it tonight and didn’t like it at all , waste of my diet cola .

    1. Hi Rhône, that’s a shame that you didn’t like it, this is one of my favourite cakes of all time.

  15. Maggie Sylvester

    Not sure where I went wrong but mine didn’t look like the picture chocolate and diet coke was rather watery even made sure to check weights as I’m a s/w member

    1. Hi Maggie, it could be a couple of reasons why this happened. Cut back on some of the milk, add a little more flour when making the mixture or that it may need cooking a little longer, everyone’s oven can be different on temperature.

  16. Cora Harrison

    I’ve a confession… I’ve never cooked with coke. I don’t think I could bring myself to do it. It’s a drink after all 😉

    1. I had the same issue, but giving it a try and I am now hooked. It make deals that little bit more special and really nice.

  17. Elaine Armstrong

    I made this cake today. I haven’t tasted it yet but I feel that there is a lot of sweetner used. Now that sweetner is syned, is this cake still 4 syns per slice ?

    1. Hello, as working out the syns based upon the new syns that Slimming World have given the cake, it now works out to be 4.5 syns per slice. Hope this clarifies everything.

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