Pat the chicken breasts dry with paper towels. If they are thick, pound them to an even thickness.
In a small bowl, combine the paprika, smoked paprika, garlic powder, onion powder, oregano, thyme, cayenne pepper, salt, and black pepper.
Rub the chicken breasts with olive oil, then coat both sides evenly with the Cajun seasoning.
Heat a large skillet over medium-high heat.
Add the chicken breasts and cook for 5 to 6 minutes per side until a golden, flavorful crust develops.
During the final minute of cooking, add the butter and spoon it over the chicken.
Continue cooking until the chicken reaches an internal temperature of 165°F (74°C).
Remove the chicken from the skillet and let it rest for 5 minutes before slicing.
Garnish with chopped parsley and serve with lemon wedges if desired.