Preheat your air fryer to 350°F to ensure it's ready for cooking when the chicken is prepared. This helps the chicken cook evenly and become properly crisp.

Place the boneless, skinless chicken breast halves on a baking sheet. Sprinkle the granulated garlic, onion granules, black pepper, kosher salt, baking powder, and corn starch evenly over the chicken. Turn the chicken to make sure it's thoroughly and evenly coated on both sides. I find tossing the chicken gently by hand ensures full coverage and better flavor.

Transfer the coated chicken to the basket of the air fryer in a single layer. Spray both sides of the chicken with olive oil spray. Air fry for 20 minutes at 350°F, flipping the chicken halfway through the cooking time so both sides cook evenly. I like to check for an internal temperature of 165°F to ensure the chicken is fully cooked.

Move the cooked chicken onto a cooking rack and let it rest for 5 minutes. This helps keep it juicy when you slice or serve it. Then, place the rested chicken onto a serving platter. Serve with your choice of cooked green beans or another vegetable, and lemon wedges if desired for a fresh, flavorful finish. I like to pair mine with extra lemon for brightness.