Preheat oven to 300° F.

Cream butter and sugars together.

Beat egg yolks into water, add vanilla and beat again.

Combine with sugar-butter mixture and beat well.

Sift flour, salt, baking powder, and soda together.

Add to dough and mix well.

Press into large cookie sheet with a rim. DO NOT GREASE PAN.

Sprinkle with chocolate chips and press into dough.

Beat egg whites until stiff peaks form.

Add brown sugar and beat again.

Spread thinly over dough mixture.

Bake at 300° for 20-25 minutes.

Cool completely before cutting.