- Prepare Ingredients: Thinly slice the red bell pepper, shred the Carrot, and thinly slice the shiitake mushrooms. Cook and shred the chicken breasts. 
- Saute Vegetables: In a pot over medium heat, sauté the red bell pepper, shredded Carrot, and sliced shiitake mushrooms until slightly softened. 
- Add Curry And Lemongrass Paste: Stir in the red curry paste and lemongrass paste, letting the aromas infuse into the vegetables. 
- Pour In Chicken Broth: Add the chicken broth to the pot, bringing the mixture to a gentle simmer. 
- Incorporate Chicken And Coconut Milk: Add the cooked and shredded chicken breasts to the pot, followed by the unsweetened coconut milk. Stir well to combine. 
- Season The Soup: Add soy sauce, brown sugar, and lime juice to the pot. Adjust the flavours according to your preference. 
- Thicken The Soup: In a small bowl, mix cornstarch with cold water to create a slurry. Stir the slurry into the soup, allowing it to thicken. 
- Serve: If desired, serve the Thai Chicken Soup over rice noodle sticks or enjoy it as is. Garnish with fresh herbs or lime wedges if you like.