Place carrots, cabbage, bell pepper, jalapeno pepper, green onions, and garlic in a mixing bowl.

Mix chicken broth, rice vinegar, hoisin sauce, soy sauce, ketchup, brown sugar, sriracha sauce, and red pepper flakes together in a separate mixing bowl.

Place dry rice noodles in a large mixing bowl. Cover with about 6 cups boiling water; add a pinch of salt. Stir from time to time until noodles are soft, about 10 minutes. Drain; cool with cold water. Drain thoroughly. Transfer to a mixing bowl. Add shredded chicken; drizzle with sesame oil. Toss to coat.

Heat large skillet over high heat; drizzle in vegetable oil. When oil is hot (almost but not quite smoking), add the vegetable mixture. Cook and stir until vegetables are hot and steamy, 1 or 2 minutes. Pour in sauce; cook and stir over high heat until sauce starts to bubble, about 1 minute. Add noodles and chicken. Cook and stir to blend ingredients and ensure ingredients are hot, about 1 minute. Remove from heat. Add chopped cilantro; stir.