In a large heavy bottomed pot over medium heat, add ground beef and Italian sausage and cook until the meat is no longer pink (about 8-10 minutes). Drain excess grease if needed.
Add onions, green pepper, and celery. Cook until softened (4-5 minutes). Add garlic and cook for 1 more minute.
Add in Cajun seasoning, kosher salt, and pepper and stir together until well combined.
Add uncooked rice and beef broth. Bring the mixture to a boil.
Reduce heat to low, cover, and simmer for about 20 minutes, or until rice is cooked through.
Remove from heat. Allow the rice to rest for 5 minutes, then fluff with a fork.
Garnish with fresh parsley before serving.