Slice the smoked sausage into thin rounds, then cut any larger pieces in half. Add the sausage and vegetable oil to a large pot and cook over medium heat until browned (about 5 minutes).
Mince the garlic and add it to the pot. Sauté for one minute until soft and fragrant. Add the frozen seasoning mix and sauté until heated through (3-5 minutes).
Add diced tomatoes, Creole seasoning, oregano, smoked paprika, thyme, cracked pepper, pasta, chicken broth, and 1 cup of water.
Place a lid on the pot and turn the heat to medium-high. Bring to a boil, then stir briefly, replace the lid, reduce heat to low, and let simmer for 10-12 minutes, stirring occasionally to prevent sticking.
While the pasta simmers, chop parsley and slice green onions.
Turn off the heat and stir in half & half or cream. Mix in most of the parsley and green onions, saving some for garnish. Serve hot!