Marinate the chicken with soy sauce, mirin, garlic powder, olive oil, black pepper, and cornstarch; massage gently to coat.
3
In a bowl, combine gochujang, chili pepper flakes, soy sauce, oyster sauce, chicken bouillon powder, sugar, mirin, black pepper, sesame oil, water, and cornstarch; stir well.
4
Heat oil in a wok over high heat; stir-fry the white parts of green onions for about 2 minutes until charred, then remove and set aside.
5
In the same wok, heat oil and sear the marinated chicken in a single layer for about 2 minutes until golden on one side, then flip and cook for 3–4 minutes until fully cooked through.
6
Return the charred green onions to the wok and stir-fry for about 1 minute to infuse their aroma into the chicken.
7
Pour the gochujang sauce into the wok and stir everything together for about 1 minute until evenly coated.
8
Serve the rice in a bowl and top generously with the gochujang chicken and charred green onions; optionally garnish with a soft boiled egg, chopped green onions, and toasted sesame seeds.