Cut block of tofu in half vertically and set side by side on a plate lined with multiple layers of paper towels. Add a thick layer of paper towels on top, weigh down with a heavy object (I used my bread box) and press for 30 minutes to remove as much liquid as possible.

Cut tofu into 1-inch cubes and place in a bowl. Drizzle with soy sauce and carefully toss to coat.

Combine cornstarch, onion powder, paprika, and white pepper in a small bowl. Add to tofu and carefully coat tofu with cornstarch mixture. Drizzle with sesame oil. Place tofu pieces in one layer in the basket of your air fryer. You might need to work in batches.

Air-fry at 390 degrees F (200 degrees C) for 6 minutes. Turn tofu pieces over and air-fry until crispy, about 6 more minutes.