From The Cuckoo's Egg by Clifford Stoll, page 136
Fold in 2 1/4 cups flour, 1/2 teaspoon salt, 1 teaspoon baking soda and a couple teaspoons of vanilla. For an extra chocolate jag, toss in 3 tablespoons of cocao. Oh, don't forget 2 cups of chocolate chips. Bake at 375 degree for 10 minutes.