This research aims to develop a food supplement for preschool children especially those who are undernourished and with stunted growth. The selected grain and vegetables of K-Sarap Mix were subjected to physicochemical analysis (moisture, water activity) and microbiological test (Heterotrophic plate, Molds, yeast count, Thermotolerant coliform, and Total coliform). The parameters involved in selecting the grain and vegetables for K-Sarap Mix include evaluation of its macro and micronutrient content, availability in the locale, affordability, and moisture content. The composition of K-Sarap Mix is rice (Oryza sativa), mung beans (Vigna radiata), Acorn Squash (Cucurbita maxima), and Upland Kangkong (Ipomea reptans). K-Sarap mix is a powder mixture of rice and selected vegetables, green in color, with green leafy leaves odor, with a slightly sweet taste, and with fine texture (mouthful). The formulation of K-Sarap Mix was based on the Recommended Energy Nutrient Intake (RENI) of pre-school children ages 3 to 5 years old, Food and Nutrition Research Institute (FNRI), Department of Science and Technology (DOST) (2018). K-Sarap formulation was subjected to physicochemical analysis (water and moisture activity, lead test), and microbiological test. (Total plate, Molds, Coliform Count, Escherichia coli, Yeast, and Mold count). K- Sarap mix passed all the physicochemical analysis and microbiological tests. Based on the nutritional analysis, K-Sarap Mix is rich in macro and micronutrients. The total calories from K-Sarap Mix are 359.97 kcal/100 g. It has Total Carbohydrates of 74.27%, Protein is 50.56 kcal/100 grams, and Fats 25-35%. The micronutrients present in K-Sarap Mix are Calcium 47.33 mg/100 g and Sodium 15.80 mg/100 g. It has Vitamin B Complex such as Vit. B1 Thiamine 5.78 mg/100.