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Method
step 1
Preheat the oven to 180C. Mix the flour, baking powder and salt together and leave to rest.
step 2
Cream the butter and sugar until light and fluffy. Add the egg and beat well. Add half of the dry ingredients and half of the milk and mix well, repeat.
step 3
Spoon the mixture into 24 cupcake cases in two bun tins. Bake for 15-20 minutes.
step 4
To make the icing: mix the sugar, milk, cocoa powder and salt in a pan and cook slowly over a medium heat until it boils. Remove and add the butter and vanilla. Leave to cool in the fridge.
step 5
When cooled add the custard powder and mix well. Spread over cupcakes and sprinkle over walnuts.