Boil a pot of water and cook the soba noodles according to the package instructions until al dente, then drain and set aside.
In a small mixing bowl, whisk together the tahini, tamari, chili oil, and water until the sauce reaches a smooth, pourable consistency.
Heat the sesame oil in a large skillet or wok over medium-high heat.
Add the ground turkey to the skillet, breaking it into small crumbles with a spatula, and cook until browned and no longer pink.
Stir in the minced garlic, grated ginger, and ground Sichuan peppercorns, sautéing for about 60 seconds until highly fragrant.
Add the chopped baby bok choy to the turkey mixture and cook for 2 minutes until the leaves are wilted but the stems remain slightly crunchy.
Pour the prepared tahini sauce and the cooked soba noodles into the skillet, tossing everything together for 1 minute to coat thoroughly.
Transfer the noodles to a bowl and garnish with freshly sliced green onions before serving warm.