Chocolate Chip Nut Bars
["2 c. flour", "1 tsp. baking powder", "1/2 tsp. salt", "1/4 tsp. baking soda", "2/3 c. shortening", "2 c. brown sugar", "2 eggs", "2 tsp. vanilla", "1 large pkg. chocolate chips", "2 c. walnuts (optional)"]
["Mix ingredients well.", "Bake at 350\u00b0 for 25 to 30 minutes in greased 9 x 13-inch pan."]
["flour", "baking powder", "salt", "baking soda", "shortening", "brown sugar", "eggs", "vanilla", "chocolate chips", "walnuts"]