Objectives of this research are to study 1) method of cooking preserved substandard bananas 2) proper amount of preserved bananas in banana custard cake 3) acceptance of banana custard cake 4) length of time banana custard cake could be kept in refrigerated temperature. This study used (p0.05) statistically difference. When substandard bananas were cooked for 15 30 and 45 minutes evaluators accepted the preserved bananas cooked for 45 minutes with the best all around score. In studying the proper amount of preserved bananas in banana custard 0 : 100 50 : 50 80 : 20 and 100 : 0 ratios of banana to palm sugar ; it was found that evaluators accepted as statistically different the ratio of 80 : 20 preserved bananas to palm sugar. In studying acceptance of banana custard cake the ratio of sponge cake to banana custard 15 : 15 grams 10 : 20 grams and 5 : 25 grams ; it was found that evaluators accepted as statistically different the ratio of sponge cake to banana custard 10 : 20 grams with the best all around score. In studying the length of time the banana custard cake could be kept in refrigerated temperature at 5±2 degrees Celsius for 3 weeks. The yeast and mold counts were 219 (CFU/g). Therefore the banana custard cake could be kept 2 weeks in a refrigerator.