Copycat Crab Casserole from Hunan Chinese Buffet is a combination of crabmeat, cabbage, celery, sweet red bell peppers, mild cheddar cheese, cream cheese,sour cream, mayo, soy sauce, freshly squeezed lemon juice and a touch of seasoning. The Copycat Crab Casserole from Hunan Chinese Buffet is then baked to perfection in a 350-degree oven for about 30 minutes.