Slow Cooker Chocolate Mint Aero Bubble Cake by BakingQueen74

Slow Cooker Chocolate and Mint Aero Bubble Cake


Slow Cooker Chocolate and Mint Aero Bubble Cake – a delicious chocolate fudge cake baked in the slow cooker with Mint Aero Bubbles! Baking in the slow cooker is so easy. The most popular recipe on my blog. Look around for loads more slow cooker cakes and bakes!

So it is Good Friday and I am bringing you …..more chocolate! Well it can’t be avoided, this is the time of year for it after all. ๐Ÿ™‚

This slow cooker chocolate and mint aero bubble cake is a cake with a difference as it is made in my slow cooker (3.5 litre oval slow cooker).

I decided to make a slow cooker chocolate and Mint Aero Bubble cake quite simply because I wanted to see the Aero Bubbles in a cake!

I have seen Maltesers and similar being used in traybakes (do make the Malteser traybake, it is delicious!) but I wanted these to go in a cake, not a no-bake or brownies. I thought the cake would look great when sliced as you would see the green circles against the dark brown chocolate cake, as well as the bubbly texture of the bubbles against the velvety cake. Well that was the idea anyway!

I saw in the traybake etc recipes that sometimes they froze the Maltesers or Aero bubbles overnight so they didn’t melt when baking. I didn’t have the patience for that so just went for it.

Slow Cooker Chocolate and Mint Aero Bubble Cake Recipe:

  • 190 g (1.5 cups) plain flour
  • 1 tsp baking powder
  • 50 g (1/3 of a cup plus 2 tablespoons) cocoa powder
  • 200 g (3/4 of a cup plus 2 tablespoons) light brown sugar
  • 125 g (half a cup plus 1 tablespoon) butter
  • 3 eggs
  • 180 ml milk
  • A large share bag of Mint Aero Bubbles


1. Grease and line the slow cooker bowl.
2. Mix the flour, baking powder and cocoa powder in a large bowl.
3. Cream the butter with the sugar then add the eggs slowly, mixing after each addition.
4. Add the milk and whisk until smooth.

Slow Cooker Chocolate and Mint Aero Bubble Cake - BakingQueen74

5. Fold in the flour mixture.
6. Pour the cake batter into the slow cooker bowl.
7. Add about half the Mint Aero Bubbles, scattering them over the top.

Slow Cooker Chocolate and Mint Aero Bubble Cake - BakingQueen74

8. Put the lid on and turn the slow cooker onto high.
9. Cook for 2-3 hours on high until firm.

This is what it looked like after 45 mins. The edges are becoming firm and the Aero bubbles are melting!

Slow Cooker Chocolate and Mint Aero Bubble Cake - BakingQueen74

Another hour later, after adding more Aero Bubbles in the centre.

Slow Cooker Chocolate and Mint Aero Bubble Cake -

Finished, after two and a quarter hours.

Slow Cooker Chocolate and Mint Aero Bubble Cake

Yummy, fudgy chocolate cake topped with minty chocolate!

Slow Cooker Chocolate and Mint Aero Bubble Cake

Slow Cooker Chocolate and Mint Aero Bubble Cake

If you like this recipe, you might also like:

Slow Cooker Cream Cheese Brownies

Slow Cooker Chocolate Cherry Blondies

Slow Cooker Lemon and Blackberry Cake

Baking in a slow cooker

See also my Recipe Index for all the recipes organised in categories (slow cooker, cake, bread etc).

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160 thoughts on “Slow Cooker Chocolate and Mint Aero Bubble Cake”

  1. A note for myself – as we are dairy free will use Raspberry Ruffle bars chopped up and Pure soya spread in place of butter and goat milk

  2. Hi, I’m just wondering what you line the slow cooker with in step 1? I’ve never done a cake in it before. This recipe looks lovely. Thanks

      1. i didnt think you could use a slow cooker unless it had water in it, is itsafe to use without liquid mine says to make sure it doesnt boil dry ?

        1. Hi Jeanette, mine have always worked fine, one is a Crockpot which can be used dry. You could always use a metal or silicone cake pan and put some water under it if you are worried about your slow cooker cracking. Good luck!

        2. I’ve just made it for the first time. a flat warming cake for our grandson who is leaving home tomorrow. It looks really good, can’t wait to taste it! One thing though, I stopped it with still 20 mins to go because it smelt like it may be burning. One side seems to be solid rock on the bottom but the other side feels ok. Fingers crossed!!

  3. Made it for the first time today and it was delicious! Not stodgy and not too sweet! Thanks for the recipe. I was suprised by how much it rose and I had the lid off a few times to check it was cooked.

  4. Great idea, did this today cooking times vary slightly mine took just over 3 hrs but is amazing !!! Thanks for the idea will be keep this for another time

  5. Hi. Have cooked this for about 2 hrs 20 mins. All the top has holes in. How did you get the cake out of the slow cooker, did you leave it to cool first ??

  6. Hi I use this recipe to make malteser cake or galaxy counters cake but I use a large cake case in the slow cooker to save all the messing lol thanks for sharing xx

  7. Looks lovely. I’ve got a large slow cooker so I’m wondering if I could put the cake in a regular cake tin inside the cooker? If so would you need to put water in the base of the cooker around the cake tin?
    Many thanks ๐Ÿ™‚

    1. Hi Susan, yes some people use a normal cake tin on top of an upturned saucer or similar, with a little water in the base of the pot. Good luck and let me know how it turns out!

        1. I’m interested in using a normal cake tin. How much water would u put in? Should the water touch the cake tin if it is sitting on a saucer or only as far up as the saucer? This looks lovely by the way!!!!

  8. Hi, Just a quick (possibly quite blonde question); you say to grease and line the bowl of the slow cooker but in the pictures it doesn’t look like you did that? I assume you mean use grease-proof paper to cover the bottom and the sides of the bowl otherwise it wouldn’t come out? Is that right?
    I’m not the biggest fan of mint aero, but want to try out making the cake in the slow cooker for sure! Thinking of other things I could exchange the aero for! Thanks, Amy

    1. Hi Amy, yes I did butter the inside of the bowl and line it around the bottom and sides with grease proof paper (cut to shape so it fit snugly). You could also use a large cake case (get them in poundshops). Other things you can use are mars bars, maltesers, fudge pieces, choc buttons etc etc. enjoy!

  9. I have a 6.5l s.c would I just double up the recipe and time or would that not work. Ive never done a cake in s.c before so thanks for any tips x

    1. Hi Becki, you could double up the amounts but it would still normally take 1-2 hours approx on high. Or you could do it in a cake tin inside your s.c. if you want a nicer shape (not so flat, and round). Good luck!

  10. This recipe looks and sounds absolutely AMAZING!!
    I WILL be making this very soon ๐Ÿ™‚
    What if before tipping the mixture into the slow cooker if i stirred in some of the bubbles? Do you think that’d just automatically melt the bubbles?

    1. Also coating the bubbles after freezing means that they don’t all sink to the bottom… Also good advice for fruit in cakes ๐Ÿ™‚
      Great recipe!!! Love my s/c

  11. oh my god! The only thing wrong with this recipe is IT TAKES SO LONG!!!!! I just can’t wait that long! Going to try it though x

  12. I’ve done carrot cake in my slow cooker which turned out lovely so keen to try this one. never done any sort of chocolate cake what cocoa powder do you use please

  13. Hi, I just wondered how long the finished cake keeps please. And does it freeze well?
    Looking forward to trying it – might try with Aero Orange Bubbles too ๐Ÿ™‚

    1. Hi there, mine didn’t keep for long as we scoffed it! It would last same time as a usual cake I’d say, so two to three days in a tupperware box or tin. I’m not sure about freezing I’m afraid as I haven’t tried it. Ooh yes, it would look nice with Orange bubbles! Good luck!

  14. Hi. Im concerned that the greaseproof paper will catch fire. Do u put it on the bottom of the cooker? On top of margarine or just a layer of papee? X

    1. Hi Michelle, it won’t catch fire,it is under a moist cake mixture. I greased the pot first with butter, and normally use baking paper which can go in the oven. Good luck with your cake if you try it!

  15. I used aero bars (they were on offer) and it was gorgeous. We had it warm with ice cream ๐Ÿ™‚ thank you great recipe

  16. Have attempted this today. My house smells amazing only thing is my bubbles have all melted (and some crystallized) and the cake looks like it has little green craters all over it. Otherwise I am impressed as never cooked any cake in slowcooker before

  17. This looks amazing, I’m going to try it tomorrow. I honestly didn’t know you could make cakes in the slow cooker! Thanks for enlightening me.

  18. I can’t wait to try this recipe. Love my slow cooker even more learning I can bake in it! Can you tell me if it’s possible to bake a Christmas Cake this way?

  19. Made this today.

    This was my first attempt at a cake in the slow cooker so wasn’t sure what to expect but OMG IT IS AMAZING!!!!

    Looks nothing like the picture as my bubbles melted but it sure tastes as good as the above picture looks.

    I will be trying again.

  20. Hi, this cake looks great and I want to try it this weekend for a bake off at work! My slow cooker is 6.5l, so should I double mixture or leave it as the recipe states?

  21. OMG I love cake – defo gonna try this maybe with different choc though – my slow cooker quite new and doesn’t need water but did you cook on high or low? X

  22. I baked mine in a loaf tin with a drop of water in the bottom of the slow cooker. It was delicious and was very easy to slice because of its shape and depth

  23. It’s delicious….Made one before Christmas and now things have quietened down a bit – I’m going to make another this weekend.

  24. Hi

    Made one of these tonight and I only seems to have taken 1-45mins for it to go firm is this ok? Put a skewer thought it and it come out clean.


  25. Having a go at this right now !!!! It’s been in the slow cooker for just 30 minutes I cannot wait to see how it turns out !!

  26. Hi. This looks amazing. But in the photo it doesn’t look like you have lined the pot with anything? Did you just grease it? Thanks.

    1. Hi Rob, the cake could of course, I have done it several time successfully, but the Aero bubbles wouldn’t stand up to being baked in the cake. I like baking in the slow cooker, that is all! ๐Ÿ™‚

  27. Just made this and it looks and tastes great, the aero bubbles did melt quite a bit and I forgot about lining it too! Doh! But still tastes great and will be sharing with the family at Sunday dinner tomorrow xx

  28. hi 74, I’m just baking this now, yay, recipes for my slow cooker, you sure are great….what I’m asking is, I’ve spraed the aero bubbles around but they seem too have all congregated too the centre of the cake, am I doing something wrong….

  29. p.s….that cake tastes absolutely amazing, I’m so proud of myself, that’s the first cake I’ve baked in years…ty 74…X

  30. Not tried this but have made salted caramel peanut butter cookie dough n used that n omg that’s the most amazing thing ever

  31. Did this last weekend and it was amazing, thanks. I added white aero balls too but was a bit pointless as the mint overpowered the white. I got it in again now but without aero balls instead using cream eggs and topping after with flakes!!!!

  32. When you say 1. Grease and line the slow cooker bowl. Do you use baking sheet/paper to line the bottom and just grease the sides?

    1. I greased the base and sides of the pot then lined the base only for this cake but since then I usually now grease the pot and line the whole bowl using baking paper or a large cake tin liner, as you can then use the paper or liner to pull the cake out. hope that helps!

      1. What would you recommend as I have a 6.5l slow cooker. Can I just follow what it say and make a smaller/flatter cake or not or do I need to do something else.

  33. HI used a 6.5 l with the above recipe and it was really good. Just wondering whether you can get away with baking it for longer on low setting? Thinking it would be good to take skiing and come home to some lovely cake!

  34. Hi ive got a round slow cooker instead of oval. My cakes been cooking for 2 hrs and looks cooked at the top but when i put a skewer in its not clean should i take it out and hope it continues to cook the middle?

  35. I’ve just made this cake and added orange matchsticks instead and it’s absolutely gorgeous. The best chocolate cake I’ve ever made. Thank you for the recipe.

  36. I’ve just made the mint aero cake and it looks pretty good, haven’t tasted it yet as its for my work colleagues tonight. The only thing I have a problem with it testing to see if it’s cooked in the middle because of the mint aero balls as obviously they don’t set. So I have a tendency of the sides being over cooked. Any suggestions?

    1. I usually use a skewer or cake tester, it should be quite easy to see if the cake is firm or not by checking an area without the chocolate, the aero balls usually melt into the cake I find. Good luck!

  37. Hiya yes I did it with the skewer. It turned out well anyway. Not all the balls melted into the cake because I added more. It was delish. Thanks for your replies.

    1. Hi Andrew, those are U.S. Conversions, for small measurements that don’t match the cup sizes, and are part of the total amount, eg third of a cup and two tablespoons. If you are using metric measurements, you don’t need to look at that at all. Hope that helps!

  38. I’ve made the cake just waiting on it cooking ๐Ÿ™‚ can you explain the ingredients, have you just given different measurements or is it 50g PLUS 2x tablespoons? Looking forward to trying it!

    1. Hi Karmen, I’m afraid I have never had to replace eggs in my recipes so I don’t have a recipe without eggs I’m afraid. I think common egg substitutes in baking are mashed banana, apple sauce, chia seeds and so on. Hope that helps!

  39. Why have I still not tried to make a cake in a slow cooker? I think this will make a fantastic treat next time I have people over and my oven is full. I’m thinking of serving it warm with cream…

  40. Mine’s been in nearly 4 hours so far and still not done lol. It’s smelling great but is full of craters for some reason. Long as it tastes good that’s all that matters though!

  41. Hi I love the idea of the slow cooked chocolate aero cake, however one of my daughters is gluten intolerant can I use gluten free flour for this recipe? Thank you

    1. Hi Karen, I don’t bake gluten-free so am not an expert at all, so I am not entirely sure if it would work. I do seem to remember an earlier comment here that someone made it using gluten-free flour though, perhaps you can have a look through and see.

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