The main objective of the present work was to study the effect of four such commercially available fats on cookie quality. The fats selected were, an emulsified bakery fat “marvo”, specially designed for cookie and biscuit production; margarine, an emulsified fat manufactured to resemble butter; a non-emulsified hydrogenated vegetable fat “dalda”, and a non-emulsified refined sunflower oil. Refined sunflower oil was selected because of its high nutritional value. Sunflower oil seeds are rich source of linoleic acid, which is one of the nutritionally essential fatty acids. The study included the effect of these four type of fats on the rheology of the cookie dough and consequently on the quality of the cookies.