
Heat the oil in a large dutch oven over medium heat. Add the bell peppers, onions, and celery. Saute for 5-8 minutes, until the vegetables are soft.
Add the sliced sausage. Saute for about 5 minutes, until browned.
Make a well in the center and add the minced garlic. Let it sizzle for about 30 seconds, until fragrant, then stir in with everything else.
Add the cauliflower rice, diced tomatoes, bone broth, and Cajun seasoning. Stir together, then add the shrimp. Increase heat to high to bring to a simmer, then continue to simmer uncovered, stirring occasionally, until the cauliflower is tender, shrimp is cooked through, and liquid is reduced, about 5-7 minutes. It will release more liquid at first and then reduce in volume again as it simmers more.
Season with salt to taste, and/or more Cajun seasoning if you like. If desired, garnish with green onions and parsley.