The Perfect White Cake

Bahan-bahan (10 porsi)

• 2 and 1/2 cups (295g) cake flour (spooned & leveled)
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 teaspoon salt
• 3/4 cup (12 Tbsp; 170g) unsalted butter, softened to room temperature
• 1 and 3/4 cups (350g) granulated sugar
• 5 large egg whites, at room temperature
• 1/2 cup (120g) full-fat sour cream, at room temperature*
• 1 Tablespoon pure vanilla extract (yes, Tbsp!)
• 1 cup (240ml) whole milk, at room temperature*
• 1 and 1/4 cups (282g) unsalted butter, softened to room temperature
• 5 cups (600g) confectioners’ sugar
• 1/3 cup (80ml) heavy cream
• 2 teaspoons pure vanilla extract (or use clear imitation vanilla for stark white frosting)
• 1/8 teaspoon salt, as needed
• optional: sprinkles, for garnish