Bring a pot of water to a boil and cook the soba noodles according to package directions, adding the baby bok choy during the last minute of cooking to blanch.
Drain the noodles and bok choy, then set aside.
In a large skillet over medium-high heat, sauté the ground turkey until browned and cooked through, breaking it into small crumbles.
Add the minced garlic and grated ginger to the skillet, cooking for another minute until fragrant.
In a small bowl, whisk together the tahini, tamari, rice vinegar, Sichuan peppercorns, chili oil, and water to create a smooth sauce.
Pour the sauce over the turkey mixture and stir to combine.
Add the cooked noodles and bok choy to the skillet, tossing everything together until well coated and heated through.
Garnish with thinly sliced green onions before serving.