In large mixing bowl, thoroughly combine KELLOGG'S® RICE KRISPIES® cereal, baking mix and the 1/3 cup sugar, breaking up the lumps in the baking mix. Stir in walnuts and currants. Add egg, orange peel and milk, mixing until mixture forms a ball. Flatten dough into 7 1/2-inch circle. Using large knife, cut into 6 wedges.Place about 2 inches apart on baking sheet coated with cooking spray. With fork, beat together egg white and water. Brush over tops of scones. Sprinkle with the 1 tablespoon sugar. Bake at 375° F about 13 minutes or until golden brown. Serve warm or cold.