Preheat the air fryer to 400°F. Place the frozen vegetables in a bowl and spray with olive oil. Toss well to coat.
Sprinkle the vegetables generously with salt, garlic, chili powder, and cayenne pepper. Toss again to coat.
Place the vegetables in the air fryer basket and air fry for 5 minutes. Shake the basket well to toss the vegetables and air fry for 5 more minutes. Repeat and air fry for 5 more minutes.
Taste a vegetable and air fry for an additional 3-5 minutes, if desired for additional crispy edges.