Bring a pot of water to a boil and cook the soba noodles according to package directions, adding the chopped baby bok choy for the final 60 seconds of cooking.
Drain the noodles and bok choy, then set aside.
In a small mixing bowl, whisk together the tahini, tamari, rice vinegar, chili oil, ground Sichuan peppercorns, and water until the sauce is smooth and emulsified.
Heat a large non-stick skillet over medium-high heat and add the ground turkey, minced garlic, grated ginger, sea salt, and black pepper.
Cook the turkey while breaking it into small crumbles until it is fully browned and slightly crispy.
Reduce the heat to low and add the cooked noodles and bok choy into the skillet with the turkey.
Pour the prepared sauce over the noodle mixture and toss thoroughly with tongs until everything is evenly coated and heated through.
Garnish with thinly sliced green onions and serve immediately.