Bring a pot of water to a boil and cook the soba noodles for 4-5 minutes until al dente, adding the baby bok choy during the last minute of cooking to blanch.
Drain the noodles and bok choy, then rinse under cold water to stop the cooking process and set aside.
In a large skillet over medium-high heat, add the ground turkey, breaking it apart with a spatula until browned and cooked through.
Stir in the minced garlic, grated ginger, ground Sichuan peppercorns, sea salt, and black pepper, cooking for 2 minutes until fragrant.
In a small bowl, whisk together the tahini, tamari, rice vinegar, and chili oil to create a smooth, spicy sauce.
Add the noodles and bok choy to the skillet with the turkey, pour the sauce over the top, and toss everything together until well coated and heated through.
Divide into bowls and garnish with freshly sliced green onions before serving.