In a large pot, heat the vegetable oil over medium heat.
Add the red curry paste, turmeric powder, and ground coriander. Sauté for 2-3 minutes until the spices are fragrant.
Pour in the coconut milk and stir to combine with the spices.
Add the chicken or vegetable broth, fish sauce, soy sauce, and brown sugar. Stir well and bring to a boil.
Reduce the heat and let the soup simmer for about 10 minutes to allow the flavors to meld.
If using dried egg noodles, cook them according to the package instructions. If using fresh noodles, add them directly to the pot with the soup.
If using cooked chicken, add it to the pot and simmer for another 2-3 minutes.
Enjoy your meal!