Pour vegetable oil into a large stock pot over medium-high heat. Add yellow onion and white part of green onion and cook until softened, about 3 minutes.
Add garlic and ginger; cook and stir until fragrant, about 30 seconds.
Add water, seasoning packets and chicken to the stock pot, bring to a boil, and reduce heat; simmer for 5 minutes. Add soy sauce and ramen noodles to the stock pot; simmer until noodles are tender, about 4 minutes, stirring occasionally.
Serve with jalapenos, green part of green onions, cilantro, and Sriracha.