Place the chicken, bell pepper, and onion in the slow cooker insert.
In a small bowl, whisk together the coconut milk, chicken broth, red curry paste, fish sauce, brown sugar, ginger, and garlic.
Pour the liquid mixture over the chicken and vegetables in the slow cooker.
Cover and cook on low heat for 4 to 6 hours or on high heat for 2 to 3 hours until the chicken is tender.
During the last 20 minutes of cooking, add the dry rice noodles to the slow cooker and push them down into the liquid to submerge.
Once the noodles are tender, stir in the lime juice and ensure the chicken is cooked through.
Divide into bowls and garnish with fresh cilantro before serving.