Preheat the oven to 350°F (175°C) and spray a baking sheet with cooking spray.

Heat a cast iron skillet on high heat until smoking hot, about 3–5 minutes.

Mix paprika, cayenne, cumin, thyme, onion powder, white pepper, and salt together in a small bowl.

Spray chicken breasts on both sides with cooking spray, then coat evenly with spice mixture.

Place chicken in the hot skillet and cook for 1 minute on each side.

Transfer chicken to the prepared baking sheet and bake in the oven until cooked through, about 5–10 minutes. Ensure the internal temperature reaches at least 165°F (74°C).