The consumption of cereal snack foods such as bis-cuits, cookies, wafers and short bread has become very popular in Sri Lanka especially among chil-dren. Among these, biscuits possess several attrac-tive features including wider consumption base, relatively long shelf life and good eating quality. Long shelf life of biscuits makes the possibility of large scale production and distribution. Good eating quality makes biscuits attractive for protein fortifi-cation and nutritional improvements, particularly in children feeding programmes, for the elderly and low income groups. Enrichment of cereal-based foods with other protein sources such as oil seeds and legumes has received considerable attention (Ayo and Olawale 2003). This is because of oil seeds and legume proteins are high in lysine, an essential limiting amino acid in most cereals.
Grain legumes, like Soybean (Glycine max) is an excellent source of protein (40-45%); hence the seeds are the richest in food value of all plant foods consumed in the world (Kure et al. 1998). It is also rich in calcium, iron, phosphorous and most of the vitamins. It is the only source that contains all es-sential amino acids. The usefulness of the grain legumes in developing high protein foods in meet-ing the needs of the vulnerable groups of the popu-lation is now well recognized and several high pro-tein energy foods have been developed industrially,
in different parts of the world (Mooriya 2003). Soy-bean plays a vital role in balancing the protein defi-ciency of our diet. Protein content of soybean is about 2 times of other pulses, 4 times of wheat, 6 times of rice grain and 4 times of milk. Soybean has 3% lecithine, which is helpful for brain devel-opment (Akubor and Ukwuru 2005). Wheat (Triticum aestivum L.) is one of the important ce-real grains because of its use for the preparation of many baked products. Unfortunately, lysine is the first limiting amino acid in wheat flour and more than 10% of which is being destroyed during bak-ing. (Saab et al. 1981).
Many countries have made great strides to im-prove their food and nutrition situation, but hunger and malnutrition remain as a serious problem in many parts of the world especially in third world countries (FAO 2007). There are large number of people in the world are chronically undernourished. Most of them are small children who are suffering from acute or chronic deficiency problems. Chronic diet-related diseases are also emerging as serious health problems in both developed and developing countries. Sri Lanka faces one of the most serious nutritional problems in protein energy malnutrition. According to the Demographic and Health Survey 2006, child nutritional status of Sri Lanka stated that prevalence of malnutrition in children aged less than 5 years are 29.4% under-weight, 14% wasting and 13.5% stunting (UNICEF 2008). A protein in