Cook bacon (8 slices) in a Dutch oven over medium heat until crispy, about 3-4 minutes. Transfer to a paper towel-lined bowl. Leave bacon drippings in the Dutch oven. When cool enough to handle, chop or crumble into small pieces.
Add sausage (13 ounces) to the bacon drippings and brown on both sides. Drain all but 2-3 tablespoons of drippings in the pan. Transfer the sausage to the bowl with bacon.
Add the celery (6 stalks), onions (1 1/2 cups), and peppers (1 green + 1 red) to the Dutch oven and cook until the vegetables are softened and starting to brown, about 6-7 minutes.
Add the garlic (1 tablespoon) and cook, stirring frequently, until fragrant for 1 minute.
In a small bowl, whisk together boiling water (3/4 cup) and Better Than Bouillon (1 heaping tablespoon) until it dissolves; set aside.
Add sherry (1/4 cup) to the vegetables, use a wooden spoon and
Add the sherry, tomatoes with their juice (2 cans), fresh thyme (4 sprigs), Cajun seasoning (1 1/2 teaspoons), bay leaf (1), and continue to cook until they release their juices, about 5-6 minutes. (There will still be juice in the pan, that's ok). Dig down to the bottom of the Dutch oven, to stir up any brown bits.
Stir in the rice (2 cups). Return the bacon and sausage back to Dutch oven. Pour in chicken stock (2 1/2 cups), dissolved Better Than Bouillon.
Bring to a boil, then reduce the heat to low and cover. Simmer until the rice is almost fully cooked, about 30 minutes. (Give the rice a good stir to check that all the rice is tender).Remove Dutch oven from heat, stir in the chicken, keep covered, and allow to sit for 20-30 minutes to ensure rice is completly cooked. Remove and discard bay leaf. Use a fork and fluff the rice and sprinkle with parsley if desired. Serve immediately. Stir in the chicken, keep covered, and allow to sit for 20 minutes to ensure rice is completely cooked and chicken is heated through. Remove and discard thyme stems and bay leaf. Sprinkle with parsley (1/4 cup) for a little pop of color. Serve immediately.