Prepare the Cajun seasoning by combining all ingredients together in a bowl. Stir to combine and transfer to an airtight container. Set aside.
Add Andouille sausage to a large skillet set over medium heat. Cook, stirring occasionally until the sausage is browned on each side, approximately 4-5 minutes. Transfer browned sausage to a plate and set aside.
Heat one tablespoon olive oil in a large skillet and increase to medium-high heat. Add the onion, celery, green pepper, and red pepper. Sprinkle with one tablespoon Cajun seasoning and stir to combine. Cook, stirring frequently until the vegetables soften and develop some color, approximately 5-6 minutes.
Add remaining olive oil and the rice to the skillet. Toast the rice for 1-2minutes, while stirring continually. Add the chicken broth and deglaze the skillet by lightly scraping the bottom with a spatula or wooden spoon to loosen any browned bits.
Bring the liquid to a boil, then immediately reduce heat to low. Cover and simmer for15 minutes. Remove lid and add the browned Andouille sausage, kidney beans, and additional Cajun seasoning, if desired. Stir to combine and cover for 5-10minutes.
Remove the lid and add the fresh parsley. Fluff the rice with a fork while stirring the parsley into the mixture. Serve immediately. Enjoy!