Preheat oven to 375 degrees. To prepare chicken, combine spices, oil, ketchup, vinegar in a baking dish and mix well; add chicken and rub evenly over chicken. Cover tight with foil. Cook for 30 minutes. Let rest for 5 minutes. Shred pulling apart with 2 forks.
Toast whole wheat buns. Place shredded chicken on bun and top with pickle slices.