Melt 3 tablespoons of the butter in a large skillet over medium heat. Add the flour and whisk for 2 to 3 minutes, or until well blended.
Add the green onions, salt, cayenne, and black pepper. Stir for 2 to 3 minutes. Slowly add the milk and stir constantly until the mixture thickens, about 4 minutes. Remove from the heat.
In a mixing bowl, combine the egg with the crabmeat and cracker crumbs. Mix gently so as not to break up the crabmeat. Fold in the milk mixture and let cool. Divide the mixture into 6 equal portions and shape into patties, in the shape of chops if you wish. In a shallow bowl, combine the bread crumbs and the rub.
Heat the remaining 4 tablespoons butter and the oil in a nonstick skillet over medium-high heat. Dredge the patties, coating evenly, in the bread crumb mixture. Fry the patties for 3 to 4 minutes on each side, or until golden brown.
Drain on paper towels and serve hot.
Yield: 6 servings