Marinate the chicken : Soak the chicken pieces in buttermilk for 30 minutes.
Coat for crispiness : In a bowl, mix flour, cornstarch, garlic powder, salt, black pepper, and paprika. Dredge the chicken in the flour mixture, shaking off excess.
Fry until golden : Heat oil in a pan and deep-fry the chicken for 5-7 minutes until crispy. Drain on paper towels.
Make the spicy glaze : In a saucepan, mix gochujang, honey, soy sauce, rice vinegar, garlic, sesame oil, and brown sugar. Simmer for 2 minutes.
Coat the chicken : Toss the fried chicken in the spicy Korean glaze until fully coated.
Prepare the creamy drizzle : Whisk together mayonnaise, Greek yogurt, lemon juice, garlic powder, and black pepper.
Garnish & serve : Drizzle the creamy sauce over the chicken and top with green onions, red onions, and sesame seeds.

Pro Tip: Serve with a side of crispy fries or steamed rice for a complete meal!