Prepare Carnitas in your slow cooker or instant pot (see recipe). When meat is fully cooked, remove from pot and place onto cutting board to shred. Heat oil in a large skillet over medium-high heat. When oil is hot, add carnitas and a few T sauce from the pot and cook until crispy.
To assemble, divide romaine, carnitas, black beans, corn, bell pepper, tomatoes, cabbage, onion, jalepenos, and cilantro evenly among your meal prep containers. If you are adding rice, now is the time.
To avoid avocado from browning, add to the salad the morning of or bring with you!