Add the olive oil and onion to a large pot over medium-high heat. Sauté for about 5 minutes until the onion becomes translucent and fragrant.
Stir in the grated ginger, minced garlic, and Thai red curry paste. Cook everything together for about 30 seconds until they become aromatic.
Pour in the chicken or vegetable broth, water, lime juice, and uncooked rice noodles. Increase the heat to high until it reaches a gentle boil.
Once boiling, stir in the coconut milk along with your shredded cooked chicken. Reduce the heat to medium-low and let it simmer for about 10 minutes.
Stir in the torn basil leaves, chopped cilantro, and scallions. Season with salt and pepper according to your taste preferences.
Serve your Easy Thai Chicken Curry Soup immediately with an extra wedge of lime on the side if desired.