Heat 1 tablespoon of sesame oil in a Dutch oven over medium-high heat.
Place the bok choy, cut side down, into the hot oil and sear until slightly charred but still firm. Remove and set aside.
Heat the remaining tablespoon of sesame oil in the Dutch oven. Add the garlic, ginger, and mushrooms, and cook for a few minutes until fragrant.
Pour in the broth and bring it to a boil.
Add the wontons and cook for 3–5 minutes.
Stir in the vinegar and soy sauce.
Ladle the soup into bowls and top each with bok choy.
Garnish each bowl with sliced scallions, sesame seeds, and a drizzle of chili oil.
