Rainbow Birthday Cake An Explosion of Colour Fun - Chef YoYo

Ingredients

• 2 1/2 cups (300g) all-purpose flour, plus more for dusting pans
• 2 1/2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 teaspoon salt
• 1 cup (227g) unsalted butter, softened
• 2 cups (400g) granulated sugar
• 4 large eggs, at room temperature
• 1 tablespoon pure vanilla extract
• 1 1/4 cups (300ml) buttermilk, at room temperature
• Gel food colourings (red, orange, yellow, green, blue, purple)
• 4 cups (480g) powdered sugar, sifted
• 1/4 cup (60ml) heavy cream
• 2 teaspoons pure vanilla extract
• Pinch of salt
• Rainbow sprinkles, edible glitter