Heat the olive oil in a large skillet over medium-high heat.
Add the sliced sausage and cook until browned, about 5 minutes.
Add the chopped onions, peppers, and garlic to the skillet and cook until the vegetables are soft, about 5-7 minutes.
Add the Cajun seasoning and smoked paprika to the skillet and stir to coat the sausage and vegetables.
Add the shrimp to the skillet and cook until they turn pink, about 3-4 minutes.
Add the cauliflower rice to the skillet and stir to combine with the sausage, vegetables, and shrimp. Cook for another 3-4 minutes until the cauliflower is tender.
Season with salt and pepper to taste.
Serve hot with chopped parsley, if desired.