Cook the soba noodles according to package directions, drain, and set aside.
Slice the chicken breast into thin, bite-sized strips and season with sea salt and black pepper.
Heat the toasted sesame 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 5-7 minutes.
Add the broccoli florets and sliced red bell pepper to the skillet, cooking for 3-4 minutes until tender-crisp.
Stir in the minced garlic and grated fresh ginger, sautéing for 1 minute until highly fragrant.
Add the cooked soba noodles, tamari, and rice vinegar to the pan.
Toss all ingredients together for 2 minutes to ensure the noodles are coated and everything is heated through.
Divide into a bowl and garnish with sliced green onions before serving.