In a large pot or Dutch oven, heat the 2 tablespoons of olive oil over medium-high heat. Allow it to warm up for about a minute.
Add the 1 pound of cubed chicken breasts to the pot. Season with salt and pepper, and cook for about 5 minutes, stirring occasionally, until the chicken is browned on all sides. Next, add in the ½ cup of diced smoked sausage and continue cooking for another 3–4 minutes.
Stir in the 1 cup of diced green pepper, 1 small minced yellow onion, and 2 tablespoons of minced garlic. Sauté the mixture until the vegetables are softened, about 4–5 minutes.
Add the 1 cup of quinoa to the pot, stirring to combine with the chicken and vegetable mixture. Sprinkle in the 1 tablespoon of Cajun seasoning and mix well.
Pour in the 2 cups of low-sodium chicken stock and the 15 ounces of diced tomatoes (with juices). Stir in the 1 teaspoon of Worcestershire sauce and give everything a good mix.
Increase the heat until the mixture comes to a boil. Once boiling, reduce the heat to low, cover, and let it simmer for about 15–20 minutes, or until the quinoa is fully cooked and the liquid has been absorbed.
Once cooked, remove the pot from the heat. If desired, stir in the 1 teaspoon of hot sauce for an extra kick. Fluff the quinoa gently with a fork, and it’s ready to serve!