Butterfly and flatten the chicken: Place a hand on each chicken breast and slice horizontally to butterfly, stopping before cutting all the way through. Open like a book.
Cover with plastic wrap and gently pound with a meat mallet or rolling pin until about 1/2 inch thick. Even thickness means even cooking.
Make the marinade: In a bowl, whisk olive oil, lemon juice, soy sauce, honey, paprika, garlic powder, onion powder, oregano, salt, pepper, and red pepper flakes if using.
Marinate briefly: Add chicken to the bowl and coat well. Let it sit 15–20 minutes at room temperature. If marinating longer (up to 4 hours), refrigerate, then bring back to room temp for 10 minutes before cooking.
Preheat the pan: Heat a large skillet over medium-high until hot.
Add a light drizzle of olive oil and swirl to coat. A hot pan is key for a good sear.
Cook the first side: Lay the chicken flat in the pan without crowding. Don’t move it for 4–5 minutes, until the underside is deep golden and releases easily.
Flip and finish: Turn the chicken and cook another 3–5 minutes, depending on thickness.
Use an instant-read thermometer; pull at 160–162°F. Carryover heat will bring it to 165°F.
Rest the meat: Transfer to a plate and rest 5 minutes before slicing. This keeps the juices from running out.
Garnish and serve: Spoon any pan juices over the top.
Add chopped parsley or chives and a squeeze of fresh lemon. Serve with rice, roasted veggies, salad, or mashed potatoes.