Boil water and cook rice as per the instructions on the packaging. Set aside.
Debone and remove the skin from the chicken thighs. Cut the meat into small cubes. Dice the onions into chunks and finely chop the scallions and garlic. Separate the white parts from the green parts of your scallions. In a bowl, mix together the chicken cubes, dashi powder, soy sauce, 1 cup of water, mirin, and brown sugar.
In a pan, cook scallions whites, garlic, onions on medium heat with vegetable oil until soft.
Once the onions have softened, add the chicken mixture from the bowl to the pan. Let it cook on medium heat for 8-9 minutes.
In the meantime, whisk in a bowl 4 eggs until they reach 85% consistency.
Gently pour the beaten eggs all over the chicken and sauce mixture. Cook for another 4 minutes, allow the eggs to set but remain slightly runny. Sprinkle chopped scallions greens over the dish.
Serve the Oyakodon over a bowl of steamed rice.Enjoy!