Confetti birthday cakes recipe | Gourmet Traveller

Ingredients

• 100 gm softened butter
• 110 gm caster sugar (1/2 cup)
• 55 gm brown sugar (1/4 cup)
• 3 eggs
• 125 ml well-shaken buttermilk (1/2 cup)
• 80 ml vegetable oil (1/3 cup)
• 1 tsp vanilla bean extract
• 300 gm plain flour (2 cups)
• 1½ tsp baking powder
• 1/4 cup rainbow sprinkles, plus extra to serve
• Meringue buttercream
• 4 eggwhites
• 200 gm caster sugar
• 200 gm softened butter