Rinse and dry the pork.
Season with salt & pepper.
Combine olive oil, oregano, cumin, onion powder and garlic powder. Rub over pork.
Add the pork (fat cap up), orange juice, green chilis, chopped onion, and minced garlic to the slow cooker.
Cook on HIGH for 7 HOURS or LOW for 10 HOURS.
Remove from slow cooker and place on large plate.
Shred the meat using two meat shredders or two large forks.
Crisp the Carnitas by spreading the shredded pork on a baking sheet and broiling 3–5 minutes until crispy OR place in a frying pan on the stovetop.
Add your favorite garnishes and enjoy!