Rinse and sort the red beans, then soak them overnight (or for 8 hours). Drain before using.
Brown the diced sausage in a Dutch oven over medium-high heat.
Sauté the garlic for 1 minute in the same pot.
Add celery, onion, and bell pepper; cook for 5 minutes.
Stir in Creole seasoning and optional hot sauce; cook for another minute.
Combine soaked red beans, dried thyme, bay leaves, chicken stock, and enough water to cover by 2 inches.
Bring to a boil, then simmer for 2 hours, stirring occasionally until the beans are soft.
Taste and adjust the seasoning with salt and pepper.
Serve over cooked white rice, garnish with green onions.