Preheat oven to 425°F. Line a rimmed baking sheet with parchment or foil and set a rack on top if you have one.
Pound chicken to an even thickness (about 0.75 inches) for even cooking. Pat dry thoroughly with paper towels.
In a small bowl, mix salt, pepper, garlic powder, paprika, onion powder, and Italian seasoning.
Toss chicken with olive oil, then sprinkle the seasoning blend evenly on both sides. Press to adhere.
Place chicken on the prepared pan with space between pieces. Drizzle lemon juice over the top if using.
Bake for 18 to 22 minutes, depending on thickness, until the internal temperature reaches 165°F at the thickest part. Start checking at 16 minutes for smaller pieces.
Rest chicken on the pan for 5 to 10 minutes, tented loosely with foil, to keep juices in.
Slice against the grain and garnish with chopped parsley. Serve warm or cool for meal prep.
Notes
For extra juiciness, dry-brine the chicken: sprinkle 0.5 teaspoons kosher salt per pound and refrigerate uncovered for 30 to 60 minutes, then pat dry and season as directed (reduce added salt slightly). Cooking time varies by thickness—use an instant-read thermometer for best results. Leftovers keep up to 4 days refrigerated.