Preheat the oven to 400°F (200°C).
Pat the chicken breasts dry and rub all over with olive oil.
Mix the paprika, garlic powder, onion powder, thyme, oregano, and smoked paprika (if using), and rub the spice mix over the chicken.
Drizzle with lemon juice, if using.
Roast until a meat thermometer reads 165°F (74°C), about 25-30 minutes depending on size.
Let the chicken rest for 5-10 minutes before slicing and serving.