Cook the Beef: In a large skillet, cook the ground beef over medium heat until browned, breaking it apart with a spoon. Drain excess fat if necessary.
Sauté Vegetables: Add the chopped onion, bell pepper, celery, and minced garlic to the skillet. Sauté until the vegetables are tender—about 5-7 minutes.
Season It Up: Stir in the Cajun seasoning, salt, and black pepper. Let those flavors marry together for a minute.
Combine Rice and Broth: Add the rice and beef broth to the skillet. Bring the mixture to a boil.
Simmer: Reduce the heat to low, cover, and simmer for 20-25 minutes or until the rice has absorbed all the liquid and is tender.
Fluff and Serve: Once the rice is done, fluff it with a fork and serve hot, garnished with green onions or parsley if desired.