Heat 2 tablespoons of oil in a medium sized pot or saucepan over medium heat. Add in the garlic and sauté until fragrant, about 1 minute. Add in the dry spices, except for the salt and pepper. After about a minute add in the brown sugar and cook until melted, stirring constantly. Mix in the chicken broth, orange juice, and lime juice.
Add the chicken to the slow cooker with the salt and pepper then pour in the liquid. Mix together with a large spoon, cover and cook on high for 3-4 hours or cook on low for 6-8 hours. Low and slow is the key to moist chicken so go as long as you can.
Transfer chicken to a plate or cutting board and shred with a fork. Transfer shredded chicken back to the slow cooker and add in remaining 4 tablespoons lime juice and chopped cilantro. Mix everything together, taste and season with more salt as needed.
For Crispy Carnitas
To add a crispy exterior that is traditional on carnitas, before you add in the extra lime and cilantro, spread the chicken onto a greased, aluminum lined sheet pan and spray the top of the chicken with cooking spray as well.
Place under the broiler on high for 5 to 10 minutes or until you get lightly browned edges on the chicken. Then add in the lime juice, cilantro and about ½ cups of the remaining liquid from the slow cooker.
Notes
Serve in warm corn tortillas, flour tortillas etc., or use in nachos, quesadillas or even enchiladas. It's a very versatile dish!