Vanilla party cake recipe | Good Food

Ingredients

• 225g unsalted butter softened, plus extra for greasing
• 350g caster sugar
• 1 tbsp vanilla extract
• 5 large egg whites
• 325g plain flour
• 25g cornflour
• 1 ½ tbsp baking powder
• 250ml buttermilk
• 3 large egg whites
• 240g caster sugar
• 1 vanilla pod halved lengthways and seeds scraped out
• 360g unsalted butter softened
• 1 tsp vanilla extract
• multi-coloured edible polka dots to decorate