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Slow cooker lemon and blackberry cake
5 from 1 vote

Slow Cooker Lemon and Blackberry Cake

A fruity slow cooker cake filled with blackberries
Course Baking
Cuisine Slow Cooker
Prep Time 10 minutes
Cook Time 2 hours
Total Time 2 hours 10 minutes
Servings 8
Calories 622kcal


  • round slow cooker
  • cake liners


For the cake:

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

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.


Calories: 622kcal | Carbohydrates: 78g | Protein: 5g | Fat: 30g | Saturated Fat: 18g | Cholesterol: 117mg | Sodium: 146mg | Potassium: 201mg | Sugar: 53g | Vitamin A: 960IU | Calcium: 101mg | Iron: 1.8mg