For the tofu: Cut the tofu into squares. Press it well to remove all the moisture. Now toss it with 1 tsp. of corn starch and coat well.
Take 1 tbsp. of sesame oil in a cast iron skillet. Saute tofu till crispy and keep aside.
Preheat Air fryer to 180 C or 360 F for 5 minutes. Lay out the tofu in one layer after spraying or brushing with some sesame oil. Air fry for about 8 minutes at 180 C or till crispy on both sides. Remove and keep aside.
Mix together dark soy sauce, hoisin sauce, hot sauce, brown sugar and rice vinegar along with cornstarch and form a slurry.
In 1 tbsp. sesame oil saute together 4 dried red chillies along with minced ginger and garlic. Add cubed onions, scallions and peppers and saute for a minute more.
Now add the Kung Pao sauce along with crispy tofu. Cook for a couple of minutes till the tofu is well coated and the sauce is thick. Garnish with peanuts, scallion greens and cilantro leaves. Your Kung Pao tofu is ready. Serve hot.
