Make the Chili Oil: Combine chili flakes, sesame seeds, garlic, ginger, sugar, salt, and a cinnamon stick in a heat-safe bowl. Heat the neutral oil in a small pan until hot (test by adding a small piece of garlic—if it sizzles, it's ready). Carefully pour the hot oil over the chili mixture and stir. Set aside to infuse. Skip this step if you already have chili oil on hand!
Melt coconut oil in a large pot. Add the white and light green parts of the green onions, the ginger, and the garlic. Sauté until fragrant.
Add in the chicken stock, bring to a bubble, then simmer for 5 minutes.
Add in the wontons along with the soy sauce, the fish sauce, and the rice vinegar (optional). Simmer for a few minutes until the wontons are heated through (I used pre-cooked).
Serve with the tops of the green onions and a big drizzle of chili oil!