This is an extremely easy method of cooking bok choy. My mother-in-law taught me this method and it is now my go-to way to cook vegetables when I'm in a hurry.
To a large pot, add salt, ginger, oil, and water. Bring to a boil.
Rinse the bok choy and separate into the leaves. When you get to the stem, you can cut it in half.
When the water is boiling, add the baby bok choy and cook for 20 seconds (if your leaves are very thick, you can do 30 seconds). Drain the water thoroughly.