Start by mixing the chili powder, smoked paprika, kosher salt, onion powder, and garlic powder in a bowl. Stir well to avoid clumps.
Drizzle the olive oil over the chicken breasts, ensuring they are coated evenly. Sprinkle the spice mix over the chicken and massage it in to integrate the flavors fully.
Preheat your air fryer to 375 degrees F. It will emit a warm smell as it heats and helps the chicken cook evenly.
Place the seasoned chicken breasts in the air fryer basket in a single layer, fitting snugly without overlapping. Check halfway through and flip to prevent uneven cooking.
When the chicken is nearly cooked, brush on the BBQ sauce. This will create a glaze without burning. Avoid applying it too early to prevent a charred exterior.
Once cooked, let the chicken rest for a few minutes to allow juices to redistribute. This ensures the meat remains tender.
Slice the chicken and serve with extra BBQ sauce on the side for added flavor.