Wash the bok choy thoroughly, separating the leaves to remove any dirt. Pat dry and chop into bite-sized pieces, keeping stems and leaves separate if possible.
Heat a large skillet over medium-high heat and add the olive oil.
Once the oil is hot, add the minced garlic and sauté for 30–60 seconds, stirring constantly until fragrant.
Add the bok choy stems to the skillet and sauté for 2–3 minutes until they begin to soften.
Add the bok choy leaves and continue cooking for 1–2 minutes, stirring gently, until wilted.
Season with salt and black pepper. Add soy sauce, sesame oil, ginger, or red pepper flakes if using.
Remove from heat immediately and serve warm.