Cook soba noodles according to package directions, then drain and rinse with cold water to prevent sticking.
Slice the chicken breast into thin, bite-sized strips and season lightly with a pinch of salt.
Heat avocado oil in a large skillet or wok over medium-high heat and sear the chicken until golden and cooked through.
Add the shredded green cabbage to the skillet and sauté for 3-4 minutes until it begins to soften while maintaining a slight crunch.
Stir in the minced garlic, grated ginger, and red pepper flakes, cooking for 60 seconds until highly aromatic.
In a small bowl, whisk together the tamari, toasted sesame oil, and rice vinegar.
Add the cooked soba noodles and the sauce mixture to the skillet, tossing vigorously to coat every strand.
Serve immediately topped with freshly sliced green onions for a bright finish.