Heat a large cast iron skillet over medium-high heat. Season the chicken breasts with salt and pepper. When the pan is hot, add the oil. When the oil shimmers, add the breasts, being very careful not to splash oil.
Reduce the heat to medium and let the chicken cook for 8–9 minutes. Do not move the chicken or it will ruin the nice crust that is forming. Flip the chicken and let it cook for another 8–9 minutes or until the internal temperature reaches 160 degrees. Larger breasts require longer cook times so be sure to check the temperature.
Transfer chicken to a plate, tent with foil, and let rest for 5 minutes before serving.
Notes
For a quick weeknight meal, serve pan-seared chicken breasts on a bed of noodles topped with homemade marinara sauce!