Place the cooked bok choy and mushrooms on top of the rice.
Wash the bok choy thoroughly and cut into 4cm pieces.
Slice carrot and onion thinly.
Heat cooking oil in a pan and stir-fry minced garlic until fragrant.
Add onion and carrot, stir-fry over medium heat.
Add bok choy and sauté until just wilted.
Season with soy sauce, oyster sauce, and pepper.
Pour in a little water or broth and simmer.
Add cornstarch slurry to thicken the sauce.
Top the rice with stir-fried bok choy and sauce to finish.