Rub the chicken breasts with Cajun seasoning.
Heat the olive oil in a large skillet over medium heat. Add the chicken breasts and cook for 6-8 minutes per side, or until cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, add the diced onion, bell pepper, and garlic. Cook for 3-4 minutes, or until the vegetables are tender.
Add the rice, chicken broth, diced tomatoes (with juices), frozen corn, and frozen peas to the skillet. Stir to combine.
Bring the mixture to a boil, then reduce heat to low. Cover the skillet and simmer for 15-20 minutes, or until the rice is cooked and most of the liquid has been absorbed.
Slice the grilled chicken and return it to the skillet. Stir to combine and heat through.
Season with salt and pepper to taste. Serve the Cajun grilled chicken and rice skillet garnished with chopped fresh parsley.