Heat the sesame oil in a large skillet over medium heat. The pan should be large enough to hold the beans without crowding.
Once the oil is hot, add the drained mung beans and stir gently to coat.
Let them cook without stirring until they begin to spatter and pop, about 2-3 minutes. This helps them get crispy.
Shake the pan to move the beans around and continue frying until the skins begin to color and crisp up, another 2 to 3 minutes.
Add the sesame seeds to the pan and use a spatula to toss gently, coating the beans.
Add a few more drops of oil if the pan seems too dry.
Remove the skillet from the heat. Carefully stir in the minced chives, a pinch of salt, and a generous amount of freshly ground black pepper.
Taste and adjust the seasoning as needed before serving warm.
Let the beans cook undisturbed for the first couple of minutes. This allows them to form a nice crust before you start shaking the pan.