How to Make It
Heat oil in a large skillet over medium-high. Sprinkle chicken evenly with salt and pepper. Add chicken to hot oil; cook until browned on both sides, 8 to 10 minutes. Transfer to a 6-quart slow cooker; add enchilada sauce, vinegar, chipotle, cumin, and cinnamon. Cover and cook on HIGH until a thermometer inserted in thickest portion of chicken registers 165°F, about 1 hour, 10 minutes. Turn off slow cooker. Transfer chicken to a large heatproof bowl; let cool 10 minutes. Shred meat into bite-size pieces. Add liquid from slow cooker to chicken; toss to coat.
Divide chicken mixture evenly among tortillas. Top evenly with cabbage, tomato, radishes, and, if using, jalapeño. Serve with cilantro and lime.