Get ready: Preheat your oven to 160°C fan/180°C/350°F/Gas Mark 4. Put 12 cupcake cases into your tin.
Start the batter with the butter: Cream your room temperature butter with your sugar until it's pale, light and fluffy, using a wooden spoon or an electric hand whisk.
Combine for cake mixture: Add all of the eggs, sift in the flour and add in the vanilla extract, then mix together until everything is well combined.
Load up the cases: Spoon equal amounts of mixture into your cupcake cases. (I use an ice cream scoop as this gives the perfect amount and ensures some uniformity.)
Time to bake: Bake for about 15-18 minutes until the cakes are golden and slightly bouncy to the touch. Then leave them to cool on a cooling rack.
Make the buttercream icing: Beat your butter until it's pale, light and fluffy. Beat in your sieved icing sugar and add in the vanilla extract or paste.
Decorate when cool: Once the cakes are cooled, pop your buttercream into a piping bag and pipe on the icing. Scatter over the sprinkles.
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