Boil a pot of water and cook the soba noodles for 4 to 5 minutes until tender, then drain and rinse under cold water to prevent sticking.
In a small bowl, whisk together the coconut aminos, honey, rice vinegar, minced garlic, and grated fresh ginger to create the teriyaki glaze.
Season the diced chicken breast with sea salt and black pepper, then sauté in a non-stick pan over medium-high heat until golden and cooked through.
Add the chopped bok choy to the pan with the chicken and sauté for 2 minutes until the leaves are wilted and the stems are tender-crisp.
Pour the prepared teriyaki glaze into the pan and simmer for 1 minute, tossing the chicken and vegetables until the sauce thickens and coats everything evenly.
In a separate bowl, toss the cooked soba noodles with the sesame oil to infuse them with flavor.
Divide the noodles into a bowl, top with the glazed chicken and bok choy, and garnish with sliced green onions and toasted sesame seeds.