Gather all the ingredients and preheat the oven to 350°F (175°C). Lightly spray a baking sheet with cooking spray to prevent sticking. This ensures that the chicken cooks evenly and doesn't stick to the pan during the baking process.
Place a cast iron skillet on the stove and heat it on high until it starts to smoke, which should take about 3 to 5 minutes. This step ensures the skillet is hot enough to create a perfect sear on the chicken, locking in the flavors and creating a crispy, flavorful crust.
As the skillet heats, combine paprika, cayenne, cumin, thyme, onion powder, white pepper, and salt in a small bowl. This spice mixture will coat the chicken, adding a bold, flavorful kick that contributes to the signature "blackened" crust.
Lightly spray both sides of the chicken breasts with cooking spray, then evenly coat them with the spice mixture. The cooking spray helps the spices stick to the chicken, ensuring a flavorful and crispy crust once seared in the hot skillet.
Place the chicken in the hot skillet and cook for 1 minute, then flip it and cook for another minute on the other side. This quick searing helps develop the blackened crust. After searing, transfer the chicken to the prepared baking sheet to finish cooking in the oven.
Bake the chicken in the preheated oven for 5 to 10 minutes, or until it is no longer pink in the center and the juices run clear. To ensure it’s fully cooked, check with an instant-read thermometer; the internal temperature should reach at least 165°F (74°C). This ensures the chicken is safe to eat and remains juicy and tender.
Plate the chicken and serve immediately, savoring the flavorful, crispy crust and tender interior. Enjoy this delicious dish as a satisfying main course or alongside your favorite sides!