Once the skillet is hot, add the oil and then the bell peppers, celery, and onion. Sauté for 4-5 minutes, or until softened.
Stir in the sausage and cook until browned on both sides, about 5 minutes.
Add the garlic and cook for 30 seconds.
Stir in the tomato paste, and cook, stirring the entire time, for 1 minute.
Stir in the chicken broth and bring to a simmer. Stir in the rice.
Cover, and cook for 5 minutes, stirring occasionally.
Remove from heat.
Stir in the Cajun seasoning to taste.
Sprinkle with chopped parsley.
Notes
Rice: It's important to use white instant rice. Using brown instant rice or regular rice will alter the cooking times and may alter the amount of broth needed.