In a bowl or a plastic bag, put chicken, olive oil, juice of a lemon, salt & pepper. Marinate in the fridge anywhere from 20 minutes to overnight. When ready to cook, let the chicken come to room temperature about 20 minutes before cooking.
Preheat oven to 350 degrees.
Heat a cast iron skillet or an oven-safe pan over medium-high heat. When the pan is hot, add avocado oil and swirl it on the pan. Remove chicken from the marinade and place directly onto a hot skillet, skin side down. Discard remaining marinade. Cook chicken for about 3-4 minutes or until a nice sear, flip over and cook for another 4 minutes.
Transfer the entire pan with chicken into a preheated oven and cook for about 12 to 15 minutes, depending on thickness.
Remove on to a plate, cover with foil and let rest for 10 min.
Notes
If using a boneless chicken breast, adjust the cooking time in the oven to 10 to 12 minutes. Chicken breasts should be at an internal temperature of 150 degrees when out of the oven. It will still continue to cook while it rests.