Preheat your oven to 350°F (175°C).
Place the stuffing cubes into a large mixing bowl.
In a large sauté pan, melt the butter over medium heat. Add the diced onions, red bell pepper, and celery. Cook for about 8 minutes, stirring occasionally, until the vegetables become soft. Then, add the minced garlic and cook for an additional 2 minutes. Stir in the chopped sage, rosemary, thyme, and cilantro (or parsley). Transfer the cooked vegetable mixture to the bowl with the bread stuffing, making sure to scrape out every last bit from the pan.
In the same pan, cook the spicy Italian sausage over medium heat for 8-10 minutes or until it's browned and thoroughly cooked. Use a metal spatula to break up the sausage into pieces no larger than ¼-inch.
In the same pan, cook the spicy Italian sausage over medium heat for 8-10 minutes or until it's browned and thoroughly cooked. Use a metal spatula to break up the sausage into pieces no larger than ¼-inch.
Add the cooked sausage (and any fat from the pan) to the bread stuffing and vegetables. Gently toss to combine.
In a separate bowl, whisk together the egg, water, and Knorr Granulated chicken flavor until well combined. Gradually pour this liquid mixture into the bread, sausage, and vegetable mixture. Lightly toss everything together to combine, being careful not to break up the bread too much. This step helps to distribute the moisture and flavor evenly throughout the stuffing.
Transfer the stuffing mixture to the prepared 9 x 13-inch baking dish, spreading it evenly.
Transfer everything to the prepared baking dish. Bake in the preheated oven for 65-75 minutes or until the top is golden and crispy.
Once done, let it cool slightly before serving.