In a large pot, heat the vegetable oil over medium heat. Add the diced red bell pepper, matchstick carrots, and half of the sliced green onions. Sauté for about 5 minutes, or until the vegetables are tender.
Stir in the Thai green curry paste and cook for an additional minute until fragrant, allowing the spices to bloom.
Pour in the 4 cups of water and the light coconut milk. Stir to combine, then add the fish sauce, mixing well.
Add the Nissin RAOH Umami Tonkotsu Flavor packets and bring the mixture to a boil. Reduce to a simmer and let it cook for about 5 minutes.
Stir in the shredded cooked chicken breast and let it heat through for another 2-3 minutes, ensuring everything is well combined.
Remove the pot from heat. Stir in the fresh lime juice and half of the chopped cilantro. Taste and adjust seasoning if necessary.
Ladle the Thai Chicken Ramen into bowls. Garnish with the remaining green onions, cilantro, chopped peanuts, and sesame seeds if desired. Serve hot and enjoy!