In a large bowl combine egg white, egg, pumpkin, evaporated milk, the 1/2 cup brown sugar, and the pumpkin pie spice. Stir in raisins and any liquid that is left in the saucepan. Spoon pumpkin mixture into prepared dish(es). In a small bowl stir together rolled oats and the 2 tablespoons brown sugar. Stir in melted butter. Sprinkle over pumpkin mixture.