In a bowl, stir together chicken broth and corn starch. Add brown sugar, light soy sauce, toasted sesame oil, rice vinegar, hoisin sauce, and sriracha sauce. Stir to combine. Set aside.
Cook Ramen noodles according to package directions, drain and set aside. Discard seasoning packets.
While noodles cook, heat a large skillet or wok over medium heat.
Add ground beef and cook, breaking it up with a wooden spatula as it cooks.
When the beef is about ¾ of the way cooked, add sliced onions, minced garlic and grated ginger to the pan and cook until fragrant, about 1 minute.
Add carrot matchsticks, sliced red bell pepper and sugar snap peas to the pan.
Continue to cook until beef is cooked through and vegetables are crisp tender, about 3-4 minutes.
Add reserved sauce to the pan and bring to a simmer. Cook over medium heat until sauce turns glossy and thickens, about 2-3 minutes.
Add the cooked noodles to the pan and stir to coat noodles with the sauce in the pan.
Serve hot and garnish each serving with sliced green onions if desired.