Lemon-Blueberry Cake with White Chocolate Frosting

Ingredients

• 3 1⁄3 cups cake flour
• ½ teaspoon salt
• ½ teaspoon baking powder
• ½ teaspoon baking soda
• ¾ cup (1 ½ sticks) unsalted butter, room temperature
• 2 cups sugar
• 1⁄3 cup fresh lemon juice
• 1 teaspoon (packed) grated lemon peel
• 4 large eggs
• 1 cup plus 2 tablespoons buttermilk
• 2 ½ cups fresh blueberries
• 11 ounces good-quality white chocolate (such as Lindt or Baker’s), finely chopped
• 12 ounces cream cheese, room temperature
• ¾ cup (1½ sticks) unsalted butter, room temperature
• 2 tablespoons fresh lemon juice
• Additional blueberries and lemon slices (optional, for garnish)