Heat butter and olive oil in saucepan on stovetop. Brown onions and tasso for 3 minutes. Add the bell pepper, mushrooms, garlic and bay leaves. Simmer for 3 minutes. Add the catfish, Worcestershire sauce, lemon juice, hot sauce, black pepper, oregano, marjoram, thyme, white pepper, red pepper, garlic powder, rosemary, and parsley flakes and simmer for 15 minutes, stirring only a few times as stirring will cause fish to break up too much. Add green onions and cream and simmer for 10 minutes stirring only when necessary. Serve immediately over pasta.
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