Preheat the oven to 425°F (220°C).
Lightly grease a 9x13-inch baking dish with cooking spray and set aside.
In a small bowl, whisk together the salt, garlic powder, Italian seasoning, paprika, onion powder, and black pepper.
Pound the chicken breasts to an even thickness using a meat mallet or rolling pin.
Place the chicken breasts in the prepared baking dish.
Generously spray both sides of the chicken with cooking spray.
Season both sides evenly with the prepared spice mixture.
Bake the Juicy Oven Baked Chicken Breasts for 17–20 minutes, or until the thickest part reaches 165°F (74°C) on an instant-read thermometer.
Remove from the oven and allow the chicken to rest for 5–7 minutes before slicing.
Garnish with fresh parsley and serve warm.