Heat oil in a large pot over medium-high heat. Add bell pepper and four of the chopped green onions and saute 2 minutes, then add garlic and saute 1 minute longer. Stir in water, chicken broth, sriracha, rice vinegar and oyster sauce and bring to a boil. Once it reaches a boil add Nissin Roah Unami Soy Sauce ramen noodles, cover and boil 4 minutes. Pour seasonings from package into a bowl and ladle out two cups of the soups broth into the bowl and stir, then return to pan. Stir in cooked chicken. Sprinkle each serving with peanuts, sesame seeds and remaining green onions. Serve warm.