Slimming World Diet Coke Chocolate Cake

Slimming World Diet Coke 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 that you can make using Coca-Cola.

A chocolate coke cake isn’t for the faint hearted however, it’s super yummy, looks sublime and is so much fun when you tell people what’s inside it; they never believe you and it’s so much fun!

Slimming World Cake Recipes

So this slimming world chocolate coke cake is super tasty, fun to make and everyone loves it. However, I have loads of slimming world cakes for people to enjoy on Mattscafe and I think just because someone is following slimming world, doesn’t mean they can enjoy food!

The cola cake is just the tipping point, one of my favourite slimming world cake recipes is this slimming world lemon drizzle cake! It might not be a coke cake but it’s a classic and who doesn’t love something with lemon in it?

I will say, lemon drizzle and coke cake aside, it’s always nice to have a bitesize treat right? Well it depends on how big your bite is I suppose, I love these slimming world chocolate chip banana muffins recipe, it’s a firm favourite in my family!

Slimming World Diet Coke Chocolate Cake Syns

Now if you think this cake is going to kill your healthy eating, then you would be wrong. This is not a syn free Slimming World Diet Coke Chocolate Cake, if that is what you’re looking for, then I’m sorry, but chocolate is not syn free.

This has been a recipe that I created a white ago, but I have been working on ways to make the recipe healthier and less syns. Well, I have now managed to get this coca cola chocolate cake down to only 8.5 syns per slice. If you replace any ingredients ingredients, then they this will change the syn values, so please check this.

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, they will use scan bran or something else like that. Well, that is not a cake.

If you’re looking for a 2 ingredient chocolate cake, then this is not it. The only way a cake can be 2 ingredients is by using a packet mix, which is not ideal, as this would be a LOT more syns!! I know a lot of people would prefer a 2 ingredient chocolate coke cake as it is convenient. The slimming world journey is about more than just convenience, which is why I prefer to make this chocolate cola cake instead of using a boxed mix to make a chocolate coca-cola cake.

All syns are correct for this cola cake as of May 2021, if anything changes please do let me know in the comments are we know slimming world change their syns often and we want this chocolate coke cake to be informative and correct on syn values for all.

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. 

People use cola in food all the time, which is why this cake has several names. Cola cake, coke cake, chocolate coke cake and so many more! If you’re on slimming world, it’s no doubt you’d have heard of this cake before!

Slimming World Diet Coke Recipes

I have to say I love all the diet coke recipes (not just this coke cake) 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. (May 2021).

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. So enjoy a yummy chocolate coke cake, at a low price, low syns and all the taste!

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. In my opinion this cola cake makes the perfect cake and everyone will love it.

I have played around with this recipe a couple of times now and this is the version that I am happy with. The first chocolate coke cake I made was far too runny and didn’t even bake! I’ve come a long way. Make sure you follow the ingredients for this coke cake otherwise it could go terribly wrong!

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? I’m always looking for ways to improve this yummy slimming world coke cake so let me know!

Equipment I Used To Make Chocolate Cola Cake

If you’re making this coke cake there are a few things you might want to have handy in the kitchen. This cola cake is easy to make but if you have kitchen equipment it’ll make the whole thing so much easier! Take a look at the affiliate links below and make your chocolate coke cake making process so much better.

If there’s any specialist equipment you use when making this coke cake recipe, let me know in the comments! I’m always looking to buy even more for the kitchen!

Slimming World Diet Coke Chocolate Cake Recipe

Here is the simple and easy to follow coke cake recipe card, if you have any issues with it please do let me know. I am always trying to updae my recipes to keep them simple and make sure they are syn checked, however stuff changes all the time.

Also let me know if you made any adapations and made the recipe your own! I’m here for that and encourage everyone to have fun in the kitchen if you’re making this yummy cola cake!

Also let me know in the comments if you like this nice little chocolate coke cake, I love it, make it every now and again as a naughty treat and have to say the family love it! I’m even thinking about making chocolate coke muffins soon, what do we think?

Slimming World Diet Coke Cake

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
Course Cake, Dessert
Cuisine Dessert, Slimming World
Servings 12 Slices
Calories 187 kcal


  • Mixing Bowl
  • Silicone Spatula
  • Springform Round Cake Tin
  • Baking Paper


  • 250 g Self Raising flour 40 Syns
  • 3 tsp Cocoa Powder 7.5 Syns
  • 1 tsp Baking Powder
  • 15 g Sukrin:1
  • 150 g Low Fat Butter 27 Syns
  • 200 ml Diet Coke
  • 150 ml Milk
  • 2 Medium Eggs
  • 1 tsp Vanilla Extract


  • 100 g Milk Chocolate 24 Syns
  • 3 tbsp Diet Coke
  • 3 tbsp Milk


  • Preheat the oven to 180°C. Grease a 7.5 inch Springform Round Cake Tin and line the base with baking paper.
  • In a mixing bowl, add all the cake 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, milk and chocolate into a saucepan and heat up gentle until the chocolate has melted and the mixture is all combined.
  • Remove mixture from the heat, leave for a few minutes until the mixture starts to cool down.
  • Spoon the chocolate mixture over the top of the cake, allow to cool and serve.


*Prices correct as of April 2021
*This is 8.5 Syns per serving.
Self Raising Flour 250 g 885 kcal £0.08
Cocoa Powder 3 tbsp 63 kcal £0.09
Egg 2 144 kcal £0.30
Sunflower Spread 150 g 540 kcal £0.24
Baking Powder 1 tsp 2 kcal £0.02
Sukrin:1 15 g 0 kcal £0.42
Milk (Skimmed) 150 ml 51 kcal £0.07
Vanilla Essence 1 tsp 12 kcal £0.09
Diet Coke 200 ml 0 kcal £0.16
Diet Coke 3 tbsp 0 kcal £0.04
Milk (Skimmed) 3 tbsp 16 kcal £0.01
Milk Chocolate 100 g 535 kcal £0.30
TOTAL   2248 kcal £1.82
PER SERVING   187 kcal £0.15
Keyword Cake, Chocolate, Desserts, Diet Coke, Slimming World, Treats

Thanks for trying out this amazing chocolate coke cake. I’ve been making this chocolate cola cake for years now and it’s been a favourite ever since. Slimming world syns carry on going up so I’m always finding ways to make this diet coke cake healthier although I highly doubt I’ll ever be able to make a syn free chocolate coke cake!

If you did like this chocolate coca cola cake recipe and want to try the coca-cola cake recipe yourself please do, let me know in the comments how you got on! Don’t forget to pin this coca-cola cake recipe UK edition to your pinterest so that others can enjoy as well!

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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