Two ways to prevent the chicken from sticking to the skillet are: (1) Bring the chicken breasts down to room temperature, and (2) preheat the cast iron skillet. Take the chicken breasts out of the fridge and place them on the kitchen counter for about 20 minutes before seasoning and cooking. To preheat the skillet, heat it over low to medium heat while you wait for the chicken to come down to room temp. You’ll know the pan is ready when you can feel the warmth radiating off of the cast iron as you hold your hand above it.