Use paper towels to pat the chicken breasts dry—this helps get a great sear. Season both sides generously with salt and pepper.
Place a large skillet over medium-high heat. Add the oil and heat for 1–2 minutes, until it shimmers.
Sear the first side. Add the chicken to the hot pan and don’t move it. Let it cook for 5 to 7 minutes, until a golden crust forms and it releases easily.
Flip the chicken and cook the second side for another 5 to 7 minutes. Cover the pan for the final 1 to 2 minutes to finish cooking through.
Use an instant-read thermometer to check the thickest part—it should register 165°F.
Transfer to a cutting board, let rest for 5 minutes, then slice and serve. For extra flavor, add a small pat of butter per breast before serving.