Heat the vegetable oil in a large pot over medium heat.
Add the diced onion and sauté until translucent, about 5 minutes.
Stir in the minced garlic and ginger, cooking for an additional 1-2 minutes until fragrant.
Pour in the chicken or vegetable broth and bring to a simmer.
Add the mixed vegetables and cook for 5-7 minutes until tender.
Fold in the potstickers gently to prevent breaking them, cooking for an additional 5 minutes.
Incorporate the soy sauce and chili paste, adjusting heat to preference.
Spoon the soup into bowls and garnish with sliced green onions and sesame seeds before serving.