Combine flour, white sugar, baking powder and salt. In a separate bowl, mix together egg, milk, vegetable oil and bananas. Stir flour mixture into banana mixture, batter will be slightly lumpy. Heat a lightly oiled griddle or frying pan over medium high heat. Pour or scoop the batter onto the griddle, using approximately ¼ cup for each pancake. Cook until pancakes are golden brown on both side, serve hot.