in slow cooker combine onion, garlic, chicken, lemon pepper, oregano, and all spice. mix to coat the chicken well.

cover and cook on low for 4 to 6 hours.

heat pita bread as directed on package. meanwhile remove chicken from slow cooker and shred on cutting board using two forks

stir yogurt into the onion and juices left in the slow cooker. put chicken in pita pocket, spoon yogurt sauce on, and top with cucumber, red pepper, and tomatoes. enjoy!