In a large bowl, combine dry ingredients. Combine yogurt, egg, butter and lemon peel; stir into dry ingredients just until moistened. Fold in blueberries. Drop by tablespoonfuls onto a greased baking sheet. Bake at 400 for 15-18 minutes or until lightly browned. Combine glaze ingredients; drizzle over warm biscuits. Recipe By : Taste of Home June/July '96