Bring a pot of water to a boil and cook the soba noodles according to package directions, then drain and set aside.
In a small bowl, whisk together the peanut butter, tamari, rice vinegar, chili oil, and ground Sichuan peppercorns until smooth.
Heat the sesame oil in a large skillet over medium-high heat.
Add the ground turkey, minced garlic, and grated ginger to the skillet, seasoning with sea salt and black pepper.
Cook the turkey while breaking it into small crumbles until it is browned and cooked through.
Stir in the chopped bok choy and cook for 2 minutes until the leaves are wilted and the stems are slightly tender.
Add the cooked noodles and the prepared sauce to the skillet, tossing everything together until well-coated and heated through.
Garnish with sliced green onions before serving.