Heat the vegetable oil in a large skillet or wok over medium-high heat.

Add the ground meat and cook until it’s browned, breaking it apart with a spoon.

Once the meat is browned, add the chopped onion and garlic. Sauté for 2-3 minutes until fragrant and the onion turns translucent.

Stir in the chopped bok choy, mixing it in until it begins to wilt, roughly 2-3 minutes.

Incorporate the soy sauce, oyster sauce (if using), rice vinegar, and sesame oil, cooking for an additional 2-3 minutes so the flavors meld.

Season with salt, pepper, and red pepper flakes to taste. Serve hot.