Bring a pot of water to a boil and cook the soba noodles according to package instructions, adding the chopped bok choy for the last 2 minutes of cooking.
Drain the noodles and bok choy, then rinse under cold water to stop the cooking process and prevent sticking.
In a small bowl, whisk together the tahini, tamari, chili oil, sesame oil, Sichuan peppercorns, and water until a smooth sauce forms.
Heat a non-stick skillet over medium-high heat and add the ground turkey, breaking it up with a spatula as it cooks.
Stir in the minced garlic and grated ginger, cooking the turkey until it is browned and cooked through.
Add the cooked noodles, bok choy, and prepared sauce to the skillet with the turkey.
Toss everything together for 1-2 minutes until heated through and well coated in the spicy sauce.
Garnish with sliced green onions before serving.