In a large bowl, combine the flour, oats, sugar, baking powder and cinnamon. In a small bowl, mix milk, butter, syrup and egg; stir into dry ingredients just until moistened. Fold in apples.
Fill greased or paper-lined muffin cups three-fourths full. Top each with a pecan half. Bake at 400° for 18-20 minutes or until a toothpick comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely.
For glaze, mix confectioners' sugar and syrup; drizzle over muffins.