• zest of one large lemon
• 1/2 cup unsalted butter (softened)
• 4 ounces cream cheese (softened)
• 1 teaspoon pure vanilla extract
• 2 cups all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 1/2 cups fresh blueberries
• 3 tablespoons unsalted butter; melted
• 1 cup confectioners’ sugar; sifted
• 1/2 teaspoon pure vanilla extract
• 2 tablespoons freshly squeezed lemon juice