Bring a pot of water to a boil and cook the soba noodles according to package directions, then drain and set aside.
Slice the chicken breast into thin, bite-sized strips and season with sea salt and black pepper.
In a small bowl, whisk together the tamari, rice vinegar, sesame oil, minced garlic, and grated fresh ginger to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, approximately 5-6 minutes.
Remove the chicken from the pan and add the broccoli, sliced bell peppers, and snap peas, stir-frying for 3-4 minutes until tender-crisp.
Return the chicken and the cooked soba noodles to the skillet.
Pour the sauce over the mixture and toss everything together for 1-2 minutes until well-coated and heated through.