Add oil to large pot. Saute onions until translucent. Add the ginger, garlic and red curry paste and cook until fragrant. Add the chicken or vegetable broth and coconut milk. Bring to a boil. Reduce to a simmer.
Add the brussels sprouts and rice noodles. Simmer 5 minutes. Add the remaining ingredients and simmer 3 minutes.
Garnish with cilantro, green onions, and red chili.