Start by slicing the sausage and prepping the shrimp. Dice the onion, bell pepper, and celery into evenly sized pieces so everything cooks at the same rate. A little uniformity helps the vegetables soften without burning.
Heat olive oil in your skillet and brown the sausage until it releases its smoky flavor. Remove it and add your vegetables to soften. When they’re fragrant, stir in the Arborio rice to lightly toast it, which helps develop a deeper, nuttier flavor in the final dish.
Add the diced tomatoes and Cajun seasoning, stirring well. Begin ladling in warm chicken stock a little at a time. Let the rice absorb each addition before adding more. This slow process is the secret to achieving a creamy, silky risotto.
Once the rice is nearly tender, stir in the shrimp along with the sausage (and chicken if using). Cook until the shrimp turn pink and the rice is perfectly creamy. Taste for seasoning and adjust with salt, pepper, or extra Cajun spices. Garnish with chopped parsley if you’d like.