Heat a large Dutch oven or soup pot over medium-high heat. Add coconut oil and sliced red onion. Sauté until translucent, about 3-4 minutes. Add minced garlic and ginger, stirring for about 30 seconds.
Stir in the red curry paste into the aromatic mixture and cook for 2-3 minutes until it thickens slightly.
Pour in chicken broth and bring to a gentle boil. Reduce heat to simmer and add cooked shredded chicken.
In a separate medium pot, boil water and cook brown rice noodles according to package instructions (about 4 minutes). Drain and rinse under cold water.
Add sliced carrots, julienned red pepper, and green beans or snow peas to the broth mixture and simmer for 5 minutes.
Blend a cup of broth with coconut milk until smooth and creamy. Pour back into the soup pot and stir well.
Allow to simmer for an additional five minutes. Finish with fresh lime juice and chopped cilantro before serving.