Chop 2 pear halves; set aside. Puree remaining pear halves to equal 1 cup. Combine pear puree, egg, oil, vanilla, and orange peel; set aside. Combine flour, oats, brown sugar, baking powder, cinnamon and salt in a large bowl; mix well. Pour liquid ingredients into dry ingredients; mix just until moistened. Fold in chopped pears and raisins. Spoon into 16 paper-lined or greased muffin cups. Bake at 400°F for 20 minutes or until wooden pick inserted near center comes out clean.