Cut off the bottom of the bok choy and rinse the bok choy. Slice the mushrooms and garlic.
Optional step: Cut the stems and seperate them from the leafy part.
Add 1 tbsp of oil to a wok/pan and once it's hot, sauté garlic over medium low heat for 30 seconds.
Add mushrooms and stir fry for 3-4 minutes before adding the stems.
Stir fry for another 2 minutes before adding oyster sauce, water and sugar. Stir well for another minute.
Add the leaves and stir fry for another 30 seconds and turn off heat.
Serve with rice and drizzle sesame oil over the bok choy mushroom stir fry. Enjoy!