A CLASSIC VANILLA CAKE - What Sarah Bakes

Ingredients

• 310g (2 +1/2 cups) plain flour
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/4 teaspoon scraped vanilla beans
• 113g butter (1/2 cup), softened
• 300g (1 + 1/2 cups) castor sugar
• 60mls (1/4 cup), flavourless vegetable oil
• 1 teaspoon vanilla extract
• 3 medium eggs
• 1 medium egg yolk
• 250mls (1 cup) buttermilk
• 400g (1 + 3/4 cup) butter, softened
• 650-800g (5 – 6 cups) icing sugar, sifted
• 3/4 teaspoon salt
• 2 teaspoon vanilla extract
• 1/2 teaspoon vanilla bean paste (optional)