Cut the chicken into bite-sized pieces.
Mix gochujang, soy sauce, minced garlic, sugar, oligo syrup, and pepper to make the marinade.
Evenly coat the chicken with the marinade and let it sit for at least 30 minutes.
Heat cooking oil in a pan and grill the chicken over medium heat.
Cook the chicken on both sides until golden and fully cooked.
Add green onion at the end and stir-fry together.
Sprinkle with sesame seeds and chili to finish.