Start by mixing 1/4 cup kosher salt into 6 cups of lukewarm water until it dissolves completely. The water should taste a bit salty but not overwhelming. This brine helps keep the chicken moist while cooking, so be careful not to leave it in too long, or it might become overly salty.
Place the chicken breasts in the brine, ensuring they are fully submerged. Let them soak for 1 to 2 hours—the longer, the better for flavor and juiciness. Keep an eye on the time to avoid a salt overload; the brine is meant to enhance, not overpower.
After brining, take the chicken out and rinse it under cold water. This washes off the excess salt. Pat the chicken dry carefully; moisture will prevent that nice golden-brown crust in the air fryer.
Spray the chicken lightly with olive oil, and then sprinkle the garlic powder, onion powder, dried parsley, smoked paprika, and cayenne pepper on both sides. The chicken should look well-seasoned with vibrant colors.
Place the chicken breasts in your air fryer basket in a single layer. Set the air fryer to cook at 375 degrees F (190 degrees C) for about 10 minutes. Keep an eye on them to ensure even cooking; overcrowding the basket can lead to uneven results.
Use a meat thermometer to ensure the chicken is fully cooked; it should reach an internal temperature of 165 degrees F (74 degrees C). The chicken should feel firm, and juices should run clear. If they are still pink, pop them back in for a few more minutes.
After cooking, let the chicken sit for a few minutes before slicing. This step allows juices to redistribute, keeping the chicken moist. Skipping this step can leave you with drier bites.