In a large skillet over medium-high heat, heat the oil. Once hot, add the sliced sausage and cook, stirring often, until nicely browned. Add the onion, celery, bell pepper, and garlic, and continue cooking, stirring frequently, until the onion turns golden, about 3–5 minutes.
Transfer everything to the slow cooker and add the remaining ingredients, except for rice and toppings. Add salt based on whether your Creole seasoning is salted (I add 1/2 teaspoon). Stir well and spread into an even layer.
Cook, covered, on low until vegetables are tender, 4-6 hours.
Discard bay leaves. If desired, add the juice of 1 lemon. Taste and adjust seasonings. Serve over rice. Add cheese and sour cream if needed to tame the heat. Enjoy!
Video
Notes
Storage: Store leftovers in an airtight container in the fridge for up to 4 days. Reheat on the stove or in the microwave until warmed through. The flavors deepen as it sits, so it tastes even better the next day!