Start by cutting the boneless chicken thighs into bite-sized cubes. This helps the meat cook quickly and absorb the marinade better. Place the cut chicken into a large mixing bowl. Make sure it’s dry before marinating—pat it with a paper towel if needed.
In another bowl, mix all the marinade ingredients: sesame oil, corn oil, gochujang paste, soy sauce, honey, gochugaru, freshly grated ginger, minced garlic, and a pinch of salt. Stir well until it becomes a smooth, thick paste that coats the spoon.
Pour the marinade over the chicken and mix well until every piece is fully covered. Cover the bowl and refrigerate for at least 1 hour. If you have more time, letting it marinate for 2–3 hours will deepen the flavor even more.
Once marinated, take the chicken out of the fridge and let it sit for 10 minutes to reach room temperature. Heat a non-stick pan or wok over medium heat. When it’s hot, add the marinated chicken directly into the pan. You don’t need extra oil since the marinade already has oil.
Cook the chicken for about 7–8 minutes, stirring occasionally. You’ll see the sauce start to thicken and cling to the chicken. Let it cook another 5–8 minutes or until the chicken is fully cooked through, slightly caramelized, and glossy. Make sure there's no pink inside.
Taste and adjust salt or spice if needed. If the sauce is too thick, you can add 1-2 tablespoons of water to loosen it.
Turn off the heat and transfer the chicken to a serving plate. Sprinkle generously with toasted white sesame seeds and freshly sliced spring onions. These toppings add crunch and a burst of freshness to balance the heat.
Serve hot with steamed rice on the side. You can also pair it with kimchi or a light cucumber salad for extra crunch. Leftovers can be stored in an airtight container for up to 2 days in the fridge.