In a large skillet over medium heat, brown the ground beef until fully cooked. Drain excess fat.

Add the diced onion, green bell pepper, celery, and minced garlic to the skillet. Sauté until the vegetables are tender, about 5 minutes.

Stir in the uncooked rice, beef broth, cajun seasoning, black pepper, and salt. Bring to a boil.

Once boiling, reduce heat to low, cover, and simmer for 20 minutes or until rice is cooked and liquid is absorbed.

Remove from heat and let sit covered for 5 minutes. Fluff the rice with a fork and garnish with sliced green onions if desired.