Wash bok choy thoroughly and cut into bite-sized pieces.
Rinse the tofu noodles in cold water and drain.
Julienne the carrot and onion thinly.
Heat some cooking oil in a pan and stir-fry the onion and carrot.
Add bok choy and stir-fry, seasoning with salt.
Add the tofu noodles and quickly stir-fry, mixing well.
Adjust the flavor with soy sauce or oyster sauce.
Transfer to a plate and serve.