Heat sesame oil in a large pot over medium heat.
Add garlic and ginger, sautéing until fragrant (about 1 minute).
Pour in the broth, soy sauce, rice vinegar, and sriracha (if using).
Bring to a gentle simmer and add mushrooms. Cook for 5 minutes.
Add bok choy and frozen potstickers, simmering until potstickers are cooked through (about 5-7 minutes).
Serve hot, garnished with green onions and sesame seeds.