01 - Preheat your oven to 425°F. Line a baking sheet with parchment paper or aluminum foil for easy cleanup.
02 - Pat the chicken breasts thoroughly dry with paper towels. Place them in a large bowl or sealable plastic bag.
03 - Drizzle the olive oil over the chicken breasts and toss to coat evenly on all sides.
04 - In a small bowl, combine the kosher salt, black pepper, garlic powder, smoked paprika, onion powder, dried thyme, and cayenne pepper if using. Mix thoroughly to combine.
05 - Sprinkle the seasoning mixture evenly over both sides of each chicken breast. Rub the seasoning into the meat gently to ensure adherence.
06 - Place the seasoned chicken breasts on the prepared baking sheet in a single layer, leaving slight space between each piece for proper air circulation.
07 - Bake for 18 to 25 minutes, depending on breast thickness, until the internal temperature reaches 165°F when measured with a meat thermometer.
08 - Remove the chicken from the oven and cover loosely with aluminum foil. Allow the meat to rest for 5 minutes to redistribute juices before slicing.
09 - Sprinkle the chopped fresh parsley over the rested chicken. Serve immediately with lemon wedges on the side if desired.