Pat the chicken dry and season with salt, pepper, and garlic powder.
Coat the chicken evenly with potato starch.
Heat oil in a deep pot to 350°F (175°C).
Fry chicken in batches until golden brown and crispy, about 8–10 minutes per batch.
Remove and let drain on a rack or paper towels.
In a saucepan, combine gochujang, soy sauce, honey, brown sugar, garlic, ginger, rice vinegar, and sesame oil.
Simmer for 3–4 minutes until slightly thickened.
Toss fried chicken in the sauce until coated evenly.
Garnish with sesame seeds and sliced green onions before serving.