Clean okra, and remove stem and tip ends; set on paper towels to dry slightly.
In a shallow bowl whisk egg white and 1/2 teaspoon garlic powder.
In a second shallow bowl combine panko, 1 teaspoon garlic powder, and salt.
Cut okra into 1-inch segments.
Place 1/4 of okra into egg white mix.
Use a fork to toss and fully coat okra pieces.
Remove okra from egg white, using the fork, shaking to remove excess egg.
Transfer to panko mixture.
Toss until all pieces of okra are well-coated.
Spray air fryer racks with nonstick cooking spray.
Place coated okra pieces on rack.
Repeat with remaining okra.
Do not crowd the okra on the rack; use multiple racks as needed.
Heat air fryer to 375 degrees.
Place rack(s) in oven, and air fry for 6 minutes.
If using more than one rack, rotate positions, and air fry for 6 more minutes.
While okra cooks, combine yogurt and barbecue sauce in a small bowl, stirring well.
Remove okra from air fryer, and serve immediately with dipping sauce.