Set your oven to 400°F. Carefully slice the chicken lengthwise, beginning at the thickest end and moving to the thinnest (from top to bottom).
Place the sliced chicken in a bowl. Drizzle with olive oil and lemon juice. Sprinkle garlic powder, onion powder, smoked paprika, salt, and black pepper. Toss to coat evenly.
Remove the chicken from the oven and let it rest for a few minutes. Garnish with fresh parsley and serve with lemon wedges if desired.