Slow Cooker Lemon and Blackberry Cake

Slow Cooker Lemon and Blackberry Cake

Trying out different cakes in my slow cooker has become a bit of a favourite pastime of mine. We do eat healthy food most (some) of the time, honest :-). This time I found a tin of blackberries in the cupboard which must have been there for a while as I usually stick to fresh fruit, especially in the summer. I thought I’d use them up in a bake and use up a lemon languishing in my fruit bowl as well. Time for a slow cooker lemon and blackberry cake!

Slow cooker lemon and blackberry cake

Tips on How to Make a Cake in a Slow Cooker

Slow cooking a cake might seem like an odd thing to do, but it keeps lovely and moist, and you can get on with other things without having to keep your eye on the oven as much, especially when you have got to know your slow cooker like I have. The slow cooker I used today is round and 3 litres in size, and it runs very hot, usually trying to burn the edges of cakes, and bringing dishes to simmering point quite quickly.

Use a clean tea towel/dish towel under the lid of your slow cooker to prevent drips from making the cake all wet.

Line your slow cooker with either baking parchment or even better a large round cake case (available in the UK from shops like Poundland).

How Long Do You Cook a Cake For In a Slow Cooker

So due to it being a very quick slow cooker, to make this cake I put the slow cooker on high for one hour, to get it going, then switched to low for the second hour. No burning and still a well cooked, firm cake, when tested with a skewer.

If you bake a cake in your own slow cooker, take into account whether your cooker runs hot or slow, and it should generally take between 1-2 hours on high. You will need to check it regularly the first time, to watch out for burning.

Making the Slow Cooker Lemon and Blackberry Cake

Back to the cake, the lemon zest goes really well with the blackberry purée, and creates a real summery flavour. If you use whole blackberries instead of mashing up blackberries from a tin, just bear in mind they will sink to the bottom during the slow cooking process.

I topped my cake with blueberry flavoured buttercream icing, as I had run out of blackberries, and the icing had a lovely purplish pink colour to it which added to the overall effect.

Before baking, swirl the mashed blackberries through the cake batter so it is distributed through the cake evenly.

Slow Cooker Lemon and Blackberry Cake

Top with the blueberry buttercream icing and enjoy the soft sponge with swirls of blackberry puree, with the thick layer of frosting on top. A delicious summery slow cooked cake!

Slow cooker lemon and blackberry cake

Slow cooker lemon and blackberry cake

Slow Cooker Lemon and Blackberry Cake

A fruity slow cooker cake filled with blackberries
5 from 1 vote
Print Rate
Course: Baking
Cuisine: Slow Cooker
Prep Time: 10 minutes
Cook Time: 2 hours
Total Time: 2 hours 10 minutes
Servings: 8
Calories: 622kcal
Author: bakingqueen74


For the cake:

  • 125 g butter (half a cup plus 1 tbsp)
  • 125 g light brown sugar (half a cup plus 1 tbsp)
  • 2 medium free-range eggs
  • 250 g plain (all-purpose) flour (2 cups)
  • 1.5 tsp baking powder
  • 200 ml milk
  • zest of a lemon
  • 1 tin blackberries in syrup drained and mashed up, or use fresh blackberries

For the blueberry buttercream icing:

  • 300 g icing sugar
  • 150 g unsalted butter
  • a handful of blueberries (or use blackberries to continue the blackberry flavours!)


  • Cream together the butter and sugar using an electric whisk.
  • Whisk together eggs and milk in a jug. Get the flour and baking powder ready in another bowl.
  • Add some of the egg and milk mixture to the butter and sugar, followed by some of the flour mixture, and mix well. Keep adding until it is all in.
  • Add the zest of the lemon and stir.
  • Grease your slow cooker pot and put in a cake case or baking paper.
  • Put half the cake mixture in, then put in the puréed blackberries.
  • Add the rest of the cake mixture on top and swirl slightly.
  • Cook for 1-2 hrs on high (see notes above) or until a skewer comes out clean.
  • Remove from the pot when it has cooled enough to handle, and allow it to cool fully on a rack. This will take quite a while.
  • Once it is completely cool you can ice it if you want to (or just eat it up!). I topped mine with blueberry buttercream made with 150 g butter, softened, and approx. 300 g icing sugar, whizzed up using the electric whisk. I microwaved a handful of blueberries in a little water for a minute on high, then left it to cool and removed the skins. Then I stirred the juice into the buttercream little by little to achieve the desired colour.
Tried this recipe?Tag me @bakingqueen74 or use hashtag #bakingqueen74!

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Slow cooker blackberry and lemon cake - a really summery crockpot cake

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I really want to have a go at making a cake in my slow cooker as this sounds lovely. I keep being a bit scared of it though but as this turned out so well I really should bite the bullet.

Oh wow! I’ve never made a cake in my slow cooker but am definitely tempted due to yours. That looks incredible. Thanks so much for joining in with #Bakeoftheweek – Great to have you part of the team. x

Wow I’ve really got to try more things in my slow cooker. My repertoire basically consists of stews! I never realised you could do cakes in one! Got to try this. #bakeoftheweek

Would be better if the ingredients were in cups, teaspoons, etc.

[…] Want cake but too hot to bake? Baking Queen74 has a brilliant slow cooker lemon and blackberry cake. […]

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