Bring a pot of water to a boil and cook the soba noodles according to package directions, adding the chopped bok choy during the last 2 minutes of cooking.
Drain the noodles and bok choy, reserving 2 tablespoons of the noodle cooking water for the sauce.
In a small bowl, whisk together the tahini, tamari, rice vinegar, chili oil, crushed Sichuan peppercorns, and the reserved cooking water until the sauce is smooth.
Heat the avocado oil in a large skillet over medium-high heat and add the ground turkey, minced ginger, minced garlic, sea salt, and black pepper.
Cook the turkey, breaking it into small crumbles with a spatula, until it is thoroughly browned and cooked through.
Add the cooked noodles and bok choy into the skillet with the turkey and pour the prepared sesame sauce over the mixture.
Toss all ingredients together for 1 minute until well-coated and heated through, then garnish with sliced green onions before serving.