Season both sides of the chicken with salt and pepper.
Add the seasoned chicken to the slow cooker.
Finely chop the chipotle peppers in adobo sauce.
Add the diced onion, crushed garlic, enchilada sauce, chopped chipotle peppers in adobo sauce, cumin, and oregano to the slow cooker.
Lightly mix the ingredients in the slow cooker. Then, add the bay leaf on top.
Place the lid on the slow cooker and cook everything on low for 3-4 hours, or until fully cooked and the chicken reaches an internal temperature of 165°F.
Once the chicken is fully cooked, carefully remove the bay leaf and chicken from the slow cooker. Place the chicken on a cutting board. Then, shred the chicken with two forks.
Add the shredded chicken back to the slow cooker, mix, and let it simmer on low for another 5-10 minutes. Then, serve this chicken tinga and enjoy!