Instructions: Beat eggs and milk together in a shallow soup plate and set aside Place 1 slice cheese, 1 slice onion, 1 slice prosciutto on each of the 4 bread slices. Top each with remaining sliced cheese and finally, with another slice of bread. Carefully dip sandwiches into egg mixture and soak bread well. Heat 2 T of butter or margarine in a large nonstick skillet over medium heat. When the skillet is hot, add 2 sandwiches. Reduce the heat to low and fry until bottoms brown, about 5 minutes. Carefully turn with a spatula and fry on the other side until browned, about 5 minutes. Keep these warm while you repeat with remaining sandwiches.

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