Preheat your oven to 375 degrees Fahrenheit. Spray a 9 by 13 inch pan with cooking spray and set aside.
In a large skillet over medium heat, add the olive oil. Add the sliced andouille sausage and cook for about three minutes, stirring to allow both sides of the sausage to brown.
Add in the garlic, onions, and bell peppers, and stir cooking for 5 to 7 minutes until the vegetables are tender.
While the veggies are cooking, combine the chicken soup, tomatoes, cajun seasoning, and rice in the casserole dish.
Add in the chicken, cooked veggies, and sausages and stir to combine.
Cover the dish and bake for 55 minutes. Remove the foil and bake for 5 more minutes. Let stand for 10 minutes, serve and enjoy!