Cook the chicken for 5-6 minutes, then flip the chicken over and cook for an additional 2-3 minutes.
Reduce to medium heat, then add the onion and cook for 5-6 minutes until translucent.
Cover the dutch oven and place it in the oven. Cook for 20-25 minutes.
Add the kale leaves to the dutch oven and stir. Cover the dutch oven again and cook in the oven for an additional 5-6 minutes.