Wash the rice: Wash 2 cups of short grain rice about three times and soak in cold water for 30 minutes.
Prepare the chicken: Marinate 450 g of chicken thighs with Korean chili pepper flakes, garlic powder, gochujang, soy sauce, oyster sauce, mirin, sesame oil, and black pepper.
Prepare the vegetables: Smash and finely chop 6 cloves of garlic, finely dice 1/2 onion, and thinly slice green onions, keeping whites and greens separate.
Sear the chicken: In a large pot, heat 2 tbsp of oil over medium-high heat. Sear the chicken skin side down for 2 minutes, then flip and cook for 3 more minutes. Remove and set aside.
Sauté the aromatics: In the same pot, add the garlic, onion, and white parts of the green onions. Sauté for about 3 minutes.
Cook the rice: Add the drained rice to the pot and stir for 1 minute. Pour in the seasoned water and bring to a boil.
Simmer: Once boiling, reduce heat to low, add the chicken on top, cover, and let simmer for 15 minutes.
Steam the rice: Remove from heat and let it steam for 10 minutes without lifting the lid.
Finish the dish: After steaming, add green onions and butter, mix well, and optionally top with mozzarella cheese.