01 -
Mix soy sauce, brown sugar, mirin, ginger, and garlic in a bowl. Add chicken, coat well, and refrigerate for 20-60 minutes.
02 -
Boil udon noodles according to package instructions. Drain and set aside.
03 -
Chop scallions, separating white and green parts. Clean and slice mushrooms. Wash bok choy leaves.
04 -
Drain chicken, reserving 1/4 cup marinade. Brown chicken in 2 tablespoons oil over medium-high heat, about 4-5 minutes per side. Remove and shred.
05 -
Sauté white scallion parts in 1 tablespoon oil. Add reserved marinade, cook until thickened. Gradually stir in broth and bring to a boil.
06 -
Add shredded chicken, bok choy, and mushrooms to the broth. Simmer covered for 3-5 minutes until vegetables are tender.
07 -
Stir in cooked noodles. Divide soup among bowls, garnish with green scallion parts, and serve hot.