Start by adding the olive oil and finely chopped onion to a large pot over medium-high heat. Sauté for about 5 minutes until the onions become translucent and slightly softened.
Stir in the grated fresh ginger, minced garlic, and Thai red curry paste. Cook for about 30 seconds to awaken their flavors.
Add the broth, water, and lime juice. Bring to a gentle boil before tossing in the uncooked rice noodles.
Once boiling, stir in the coconut milk and shredded cooked chicken. Lower the heat to medium-low and let it simmer for about 10 minutes.
Stir in torn fresh basil, chopped cilantro, and scallions. Season with salt and pepper to taste.