Ingredients

The following ingredients have 24 Servings
  • 2 sticks (8 ounces) unsalted butter, very soft
  • 1 tablespoon vanilla
  • 2 cups granulated sugar
  • 1 teaspoon lemon zest
  • 4 large eggs, at room temperature
  • 1 cup full-fat sour cream
  • 1/2 cup whole milk
  • 3 and 1/4 cups plus 2 tablespoons cake flour, divided
  • 1 and 1/2 teaspoons baking powder
  • 1/2 teaspoon baking soda
  • 3/4 teaspoon salt
  • 2 cups blueberries, fresh or frozen, if using frozen don't thaw first
  • 2 sticks (8 ounces) unsalted butter, VERY soft
  • 2 and 1/2 cups confectioners' sugar
  • 1/4 teaspoon salt
  • 2 tablespoons full-fat sour cream
  • 1 tablespoon whole milk
  • 6 ounces white chocolate, melted and cooled for 10 minutes (see post for more on this)
  • 1 cup blueberries, fresh or frozen, if using frozen don't thaw first
  • 1 tablespoon fresh lemon juice

Instruction