Preheat the oven to 450°F and position a rack in the middle of the oven.
In a shallow dish, whisk together 2 tablespoons paprika, 1/4 teaspoon cumin, 1/4 teaspoon cayenne pepper, 1/2 teaspoon Italian Seasoning herbs, 1 tablespoon dried thyme, 1 tablespoon onion powder, 1 tablespoon garlic powder, 1 teaspoon kosher salt, and 1/4 teaspoon ground black pepper.
Pat 4 boneless skinless chicken breasts (about 1/2 lb. each) dry with paper towels.
Coat both sides of the chicken with 2 tablespoons canola oil.
Press each oiled chicken breast into the seasoning mixture so the spice rub adheres to both sides.
Heat a large cast-iron skillet over high heat until very hot and just starting to smoke, about 5 minutes.
Add the remaining 1 tablespoon canola oil to the skillet and spread it to coat the bottom.
Add the chicken breasts to the hot skillet (do not crowd; cook in batches if necessary). Cook about 30 seconds on each side to blacken the surface.
Transfer the skillet to the preheated oven and roast the chicken for 12–15 minutes, until the meat is no longer pink in the center and an instant-read thermometer inserted into the thickest part registers 160°F.
Remove the chicken to a platter, tent with foil, and let rest for 5 minutes before slicing and serving.