In a large pot, heat the sesame oil over medium heat. Add minced garlic and grated ginger, sauté for about 30 seconds until fragrant.
Pour in the chicken or vegetable broth and bring to a gentle boil.
Once boiling, add the frozen potstickers to the pot. Allow them to cook according to package instructions (usually around 5-7 minutes).
Add the sliced mushrooms and chopped bok choy to the pot. Simmer for an additional 3-4 minutes until the bok choy is tender and mushrooms are cooked through.
Stir in the soy sauce and season with salt and pepper to taste.
Serve the soup hot, garnished with sliced green onions and fresh cilantro if desired.