Mince the garlic and finely slice the chili (if using). Wash and trim the ends off the bok choy, then chop into 1-inch pieces.
In a small bowl, combine the tahini, hoisin sauce, miso paste, sriracha, garlic, bouillon powder, and Chinese five spice to make the stock paste. Mix until smooth.
Divide the dry vermicelli noodles evenly between 4 medium-size jars or lunch containers. Break the noodles into smaller bundles if needed to fit.
Add 1/4 cup of dry textured vegetable protein (TVP) to each container. Top with equal portions of chopped bok choy and sliced chili (if using). Add a generous spoonful of the stock paste to each.
Seal the containers and refrigerate until ready to eat. (Best consumed within 3β4 days.)
To serve, pour boiling water over the contents until fully submerged. Let sit for 2β3 minutes, then stir to dissolve the paste and soften the noodles. Enjoy hot!