Heat a large skillet over medium-high heat. Add the oil and heat until shimmering. Add the garlic and cook, stirring, for about 30 seconds. Add the bok choy cut-side down and cook, continuing to stir the garlic to keep it from burning but without moving the bok choy to get a nice even sear, until the bok choy is dark brown on the bottom, 2 to 3 minutes. Add the soy sauce, soy molasses or oyster sauce and a few tablespoons of water. Serve immediately or cover and hold in the skillet until ready to serve.
Soy Molasses Sauce:
Combine the soy sauce, molasses, sesame oil, garlic, ginger powder, fish sauce, rice wine vinegar and honey in a saucepan on medium-high heat. Bring to a slight boil, whisking or stirring constantly. Cook for 4 to 5 minutes. Set aside.