Begin by rinsing the bok choy thoroughly under cold water to remove any grit. Slice the bok choy in half lengthwise if large, or leave whole if small. Set aside.
Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the minced garlic and grated ginger to the skillet. Stir-fry for about 30 seconds, or until fragrant. Be careful not to let them burn.
Add the bok choy to the skillet, stirring gently to coat the leaves in the garlic and ginger mixture.
Cook for about 5 minutes, stirring occasionally, until the bok choy is tender but still vibrant green.
Pour the soy sauce and sesame oil over the bok choy, and stir well to combine. Cook for an additional 1-2 minutes.
Remove from heat. If desired, sprinkle sesame seeds on top for added crunch and flavor. Season with salt and pepper to taste.
Serve immediately as a side dish, alongside your favorite main course.