Heat a skillet with oil. Add the garlic and saute for 30 seconds or until slightly browned. Constantly stirring and keep an eye on the garlic to make sure they don't burn.
Add the prawns to the pan, season with salt. Cook them for about a minute on each side.
Add the chili pepper in oil, and once the prawns are cooked, remove them from the pan, set aside. Add the Bok Choy into the pan and cook until wilted. Drizzle sesame oil, stir to combine.
Place the prawns back into the pan. Add green onions and red chili pepper, stir to combine. Serve warm.