Gently fold in the dry ingredients into the butter mixture. Then gently fold in the sour cream mixture, and finally the blueberries. You don't want to overmix and over develop the gluten
In a bowl combine powdered sugar, lemon juice, and lemon juice. Whisk together if the mixture is too thick add a splash of lemon juice at a time until desired consistency.
In a bowl combine powdered sugar, lemon juice, and lemon juice. Whisk together if the mixture is too thick add a splash of lemon juice at a time until desired consistency.