Heat the vegetable oil and sesame oil in a large pot over medium heat.
Add the garlic and ginger and sauté for 1–2 minutes until fragrant.
Pour in the chicken or vegetable broth. Stir in the soy sauce, rice vinegar, and chili garlic sauce (if using). Bring the mixture to a gentle boil.
Add the sliced mushrooms to the broth and simmer for 5 minutes, or until tender. Stir in the chopped bok choy and simmer for another 3–4 minutes until the bok choy is wilted.
Carefully add the frozen potstickers to the soup. Simmer according to the package instructions, usually 5–7 minutes, until the potstickers are cooked through.
Ladle the soup into bowls, ensuring each bowl gets a few potstickers and plenty of vegetables. Garnish with sliced green onions and fresh cilantro, if desired. Serve hot.
