Trim bases of bok choy and separate outer leaves from stalks, leaving the smallest inner leaves attached. Rinse and thoroughly dry bok choy.
Heat a wok or large frying pan over medium-high heat until hot when you wave your hand over the bottom. Add olive oil, garlic, and ginger and stir once; then immediately add mushrooms and stir-fry until they just begin to brown, 1 to 2 minutes.
Recipe adapted from My Recipes