Coat a large skillet with cooking spray and brown chicken and/or sausage over medium heat. If using raw shrimp, add during the last 2-3 minutes; if using cooked shrimp, add that at the very end.
Once meat is cooked through, remove from skillet and set aside. Respray the skillet and saute the veggies (if using) on medium high heat for 5-7 minutes. Return the meat to the pan with the veggies and pour in the sauce. Cover and simmer 10-15 minutes. Stir in the rice; bring back to a simmer. Serve.