Heat sesame oil in a large pot over medium heat.
Add minced garlic and ginger, sauté for 1-2 minutes until fragrant.
Pour in the chicken broth, soy sauce, rice vinegar, and chili garlic sauce (if using). Bring to a boil.
Add frozen potstickers and simmer according to package instructions (typically 5-8 minutes).
Stir in baby spinach and green onions. Let simmer for 1-2 minutes until spinach wilts.
Serve hot, garnished with toasted sesame seeds if desired.