Preheat oven to 450? F. Lightly spray a rectangular baking pan and slightly smaller cooling rack with vegetable oil spray. Put rack in baking pan. Set aside. ln a food processor or blender, process bread into fine crumbs. Pour into a shallow bowl. Stir in Parmesan, parsley, paprika, garlic powder, and thyme. Pour buttermilk into a shallow bowl. Rinse chicken and pat dry with paper towels. Dip chicken into buttermilk; shake off excess liquid, dredge in crumbs. Put chicken on rack in pan. Spray each breast with vegetable oil spray. Bake for 15 minutes, turn chicken, and bake for 10 minutes, or until done. Serve.