Heat a large pot over medium. Add ground meat and cook until browned. Drain excess fat if needed.

Add onion, green pepper, and celery. Cook until softened, about 5 minutes.

Stir in garlic and homemade Cajun seasoning. Cook 30 seconds until fragrant.

Add rice, broth, and thyme. Bring to a boil, then reduce heat to low.

Cover and simmer until rice is tender and liquid is absorbed, about 20 minutes. Add more liquid if needed.

Season with salt and extra pepper to taste.

Fluff rice with a fork. Garnish with spring onions if desired.