Bring a pot of water to a boil and cook the soba noodles according to package directions, then drain and set aside.
In a large skillet over medium-high heat, cook the ground pork until browned and crispy, breaking it into small crumbles.
Add the minced garlic, grated ginger, and ground Sichuan peppercorns to the pork, sautéing for 1 minute until fragrant.
Toss in the baby bok choy and cook for 2-3 minutes until the leaves are wilted and the stems are tender-crisp.
In a small bowl, whisk together the tamari, rice vinegar, sesame oil, and chili oil to create the sauce.
Add the cooked noodles to the skillet, pour the sauce over the mixture, and toss everything together until well-coated.
Serve the noodles topped with crushed roasted peanuts and thinly sliced green onions for a fresh crunch.