Chewy Chocolate Chip Bars
["1 c. butter", "1/2 c. sugar", "1 c. brown sugar, divided", "1 Tbsp. water", "1 tsp. vanilla", "2 eggs, separated", "2 c. flour", "1/2 tsp. salt", "1/2 tsp. baking soda", "1 tsp. baking powder", "3/4 c. chocolate chips", "3/4 c. finely chopped walnuts"]
["Cream together butter, sugar and 1/2 cup brown sugar.", "Add water, vanilla and egg yolks (reserve egg whites in separate bowl) and beat 2 minutes.", "Beat in flour, salt, baking soda and powder. Spread batter in lightly greased 13 x 9 x 2 inch baking pan. Sprinkle with chocolate chips.", "Beat egg whites until they form soft peaks, then add 1/2 cup brown sugar.", "Spread over chips and sprinkle with chopped nuts.", "Bake for 35 minutes at 350 degrees."]
["butter", "sugar", "brown sugar", "water", "vanilla", "eggs", "flour", "salt", "baking soda", "baking powder", "chocolate chips", "walnuts"]