Combine first 6 ingredients in a large bowl. Stir in pear; make a well in center of mixture. Combine buttermilk and next 5 ingredients (buttermilk through egg) in a bowl; stir well with a whisk. Add to flour mixture, stirring just until moist. Spoon batter into an 8 x 4-inch loaf pan coated with cooking spray.
Bake at 350° for 1 hour and 5 minutes or until a wooden pick inserted in center comes out clean. Cool 10 minutes in pan on a wire rack; remove from pan. Cool completely on wire rack.