Bring a pot of water to a boil and cook the soba noodles according to package directions, adding the chopped baby bok choy during the last minute of cooking to blanch.
Drain the noodles and bok choy, then set aside.
In a small bowl, whisk together the tamari, tahini, chili oil, and water until smooth to create the sauce base.
Heat the sesame oil in a large skillet over medium-high heat.
Add the ground turkey to the skillet and cook until browned, breaking it into small crumbles with a spatula.
Stir in the minced garlic, grated ginger, and crushed Sichuan peppercorns, cooking for 1 minute until fragrant.
Add the cooked noodles, bok choy, and prepared sauce to the skillet, tossing everything together for 1-2 minutes until evenly coated and heated through.
Garnish with thinly sliced green onions and serve immediately.