1. Remove stems from mushrooms; slice mushrooms. Place mushrooms, bell pepper, and next 3 ingredients (through bamboo shoots) in a 7-quart electric slow cooker. Combine hoisin sauce and next 5 ingredients (through garlic) in a small bowl. Stir into vegetable mixture in slow cooker.
2. Heat in a large nonstick skillet over medium-high heat. Add canola oil to pan; swirl to coat. Sprinkle turkey thighs evenly with five-spice powder and black pepper. Add half of turkey to pan. Cook 3 minutes on each side or until browned. Add turkey to slow cooker. Repeat procedure with remaining turkey. Cover and cook on LOW for 5 hours or until turkey is tender.
3. Remove turkey from bones; cut meat into bite-sized pieces. Discard bones. Stir cabbage into vegetable mixture. Serve vegetables and broth in individual bowls. Top with turkey; sprinkle evenly with green onions.