In a large skillet over medium heat, add the 1 pound of lean ground beef. Cook until browned, breaking it apart with a wooden spoon as it cooks, which should take about 5-7 minutes.
Once the beef is browned, add the 1/2 cup of finely chopped chicken gizzards. Stir well and cook for an additional 3-4 minutes until the gizzards are cooked through.
Next, add the 1/2 cup of finely diced green bell pepper and 1/3 cup of sliced green onions to the skillet. Sauté for about 3 minutes until the vegetables are tender.
Sprinkle in the 1/2 teaspoon of garlic powder, 1/2 teaspoon of celery flakes, 1 teaspoon of Tony Chachere's Creole Seasoning, 1/4 teaspoon of red pepper flakes, and 1/4 teaspoon of ground black pepper. Mix everything together and let the spices cook for 1-2 minutes, allowing the flavors to meld.
Stir in the 4 cups of cooked and drained long-grain rice. Mix everything until the rice is well-coated with the spices and meat mixture.
Pour in 1 1/3 cup of water. Stir gently to combine. Allow the mixture to simmer over low heat for about 5 minutes, letting the rice absorb the flavors.
Once the rice is heated through and the water has mostly evaporated, remove from heat. Serve your Copycat Popeyes Cajun Rice hot, garnished with additional green onions if desired. Enjoy the rich flavors in every bite!