Boil a pot of water and cook the soba noodles according to package directions, adding the baby bok choy for the last 60 seconds of cooking.
Drain the noodles and bok choy, then rinse under cold water to stop the cooking process and set aside.
In a dry skillet over medium heat, toast the Sichuan peppercorns until fragrant, then crush them into a fine powder using a mortar and pestle.
In the same skillet, add the sesame oil and sauté the ground turkey over medium-high heat until browned and cooked through.
Stir in the minced garlic and grated ginger, cooking for another minute until the aromatics are fragrant and soft.
In a small bowl, whisk together the tahini, tamari, rice vinegar, chili oil, sea salt, black pepper, and the crushed Sichuan peppercorns.
Add the cooked noodles and bok choy to the skillet with the turkey, pour the sauce over the mixture, and toss everything together until well coated.
Serve immediately in a bowl, garnished with sliced green onions for a fresh crunch.