Chocolate Chip Bars
["2/3 c. shortening", "1 c. sugar", "1 c. brown sugar", "3 eggs, beaten", "2 1/4 c. flour *", "1 tsp. salt *", "1/2 tsp. soda *", "1/2 tsp. baking powder (which has been sifted) *", "1 tsp. vanilla", "1 pkg. chocolate chips", "nuts (if desired)"]
["*You can use 2 1/4 cups self-rising flour."]
["shortening", "sugar", "brown sugar", "eggs", "flour", "salt", "soda", "baking powder", "vanilla", "chocolate chips", "nuts"]