Sprinkle shrimp with Thai seasoning; toss well. Heat a Dutch oven over medium-high heat; coat pan and shrimp with cooking spray. Add shrimp to pan; sauté 2 minutes or until shrimp are almost done. Remove shrimp from pan; set aside. Coat pan with cooking spray; add bell pepper, and sauté 2 minutes.
Add chicken broth and fish sauce to bell pepper in pan; bring to a boil. Reduce heat; simmer 5 minutes. Stir in coconut milk and reserved shrimp. Cook 2 minutes or until thoroughly heated. Remove from heat; stir in lime juice. Stir in cilantro, if desired.