Heat sesame oil over medium heat; sauté garlic, ginger, and sweet onion until softened.
Add rice wine and chicken broth; stir, add ramen noodles. Break apart the noodles gently with a spoon; turn heat to high and bring mixture to a boil. Boil for 6 minutes, or until noodles are softened.
Return heat to low and add soy sauce, Sriracha, sweet chili sauce, and black pepper. Simmer for five minutes.
Add rotisserie chicken and cook until heated through. Top with scallions and sesame seeds, if desired, and serve with additional Sriracha.
