Add all sauce ingredients to a bowl and mix until just combined.
Heat oil in a skillet over medium heat. Add tofu, soy sauce, starch, salt, pepper and garlic powder. Toss until tofu is fully coated. Cook for about ~5 minutes each side, until browned.
Add cooked noodles to a big bowl along with tofu, bok choy and cilantro. Toss with tahini sauce.
Divide out noodles and top with sesame seeds.
Notes
This makes 2-3 servings of tofu.Make sure you use a high quality tahini that is not bitter. Soom foods or Mighty Sesame are both great options.