Evenly sprinkle both sides of fillets with pinches of kosher salt and freshly ground black pepper. Set aside. In a large, oven-proof pan, heat the olive oil over high heat. Once oil is sizzling hot, add the fish fillets to pan and let cook until browned on one side, about 3 minutes (do not move fish around much.) Carefully flip fish fillets over to the other side, turn stove burner off, and immediately transfer pan into already-hot oven. Let fish roast at 400F about 5 minutes or just until the top is golden and center is just cooked through. Take care not to overcook.