Blueberry Cake

Bahan-bahan (1 porsi)

• ½ cup unsalted butter ((8 Tbsp; softened at room temperature))
• ¾ cup sugar ((for butter))
• 2 large egg yolks
• 1 tsp pure vanilla extract
• ¼ tsp Diamond Crystal kosher salt
• 1 ½ cups all-purpose flour (plain flour)
• 1 tsp baking powder
• ½ cup milk
• ¼ cup sugar ((for egg whites))
• 2 large egg white
• 1 Tbsp all-purpose flour (plain flour)
• 1 ½ cups blueberries
• white sparkling sugar ((or sugar, for sprinkling))