In a small bowl, combine the oregano, salt, white pepper, black pepper, cayenne pepper, thyme, and basil. Set aside.
Melt the butter in a large Dutch oven over medium heat.
Add the chopped tomatoes, onion, celery, green bell pepper, and garlic. Cook for about 5 minutes until the vegetables soften and the onion becomes translucent.
Stir in the chicken stock, tomato sauce, sugar, hot sauce, and bay leaves.
Add the prepared seasoning mixture and stir well.
Reduce the heat to low and let the sauce simmer for about 20 minutes to develop its rich Creole flavor.
Gently stir in the shrimp, scallops, and haddock.
Simmer for another 15–20 minutes until the seafood is fully cooked and opaque. Avoid overcooking to keep the seafood tender.
Remove the bay leaves before serving.
Serve the Seafood Creole hot over steamed white rice and garnish with chopped parsley and fresh lemon wedges.