Prepare the Chicken: Place the chicken thighs at the bottom of the crockpot. Season with salt and pepper.
Add Vegetables: Layer the bell pepper, carrots, mushrooms, and onion on top of the chicken.
Mix the Broth: In a separate bowl, whisk together the coconut milk, chicken broth, garlic, ginger, red curry paste, soy sauce, lime juice, fish sauce, and sugar until well combined.
Combine: Pour the mixture over the vegetables and chicken in the crockpot. Stir gently to distribute the ingredients evenly.
Cook: Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is tender and cooked through.
Shred the Chicken: Once cooked, remove the chicken from the crockpot and shred it with two forks. Return the shredded chicken to the soup.
Serve: Taste the soup and adjust seasoning if needed. Ladle the soup into bowls, garnishing with fresh cilantro and a lime wedge on the side.
Notes
Adjust the spice level by adding more or less red curry paste.