Preheat oven to 350 degrees F. Line cookie sheet with parchment paper and set aside.
In a large bowl, cream together margarine, water and sugars with an electric mixer on a high speed for 2 minutes. Add egg whites and vanilla and mix well. Blend in flour, baking soda and salt. Mix well. Add chocolate chips and blend thoroughly.
Scoop dough in rounded 1/2-teaspoonfuls and place on prepared cookie sheet about 1 inch apart. Bake until deep golden brown. Cool completely and serve.
(For variety, add 1/2 cup rolled oats, 1 cup raisins or 1 cup dried cranberries.)
Tips for the perfect cookie
* Be sure to measure ingredients accurately with standard measuring cups and spoons. The correct amount of ingredients will ensure that the cookies won't bake too dry, crumbly or so soft that they spread too much during baking.
* Shiny, heavy-gauge aluminum cookie sheets are excellent heat conductors and will produce the most evenly baked and browned cookies.
* Unbaked cookie dough can