Preheat oven to 350°F.
Toss chicken thighs in Cajun seasoning. Bake until internal temperature reaches 165°F. Cool slightly, then cube.
Sauté onion, celery, and bell pepper in butter until slightly soft.
Prepare gravy mix according to package directions, using 4 qt. of water.
Add sautéed vegetables, chicken, sausage, tomatoes, okra, and Worcestershire sauce to prepared gravy. Season to taste with additional Cajun seasoning and Tabasco® sauce. Simmer over low heat for 1 hour, stirring occasionally.
Add additional water if necessary to obtain desired viscosity.
Serve as is or over rice.