Lemon Blueberry Drop Scones

In a large bowl, combine the first 6 ingredients. In another bowl, combine the yogurt, egg and butter. Stir into dry ingredients just until moistened. Fold in blueberries. , Drop by heaping tablespoonfuls 2 in. apart onto a greased baking sheet. Bake at 400° for 15-18 minutes or until lightly browned. Combine glaze ingredients; drizzle over warm scones.