Okinawan deep-fried cake, similar to a doughnut
Sift together the flour, baking powder, and salt. In a separate bowl, whisk the sugar and egg until well combined, then add the oil and mix thoroughly. Add the flour mixture to the egg mixture and mix with a spatula until a dough forms. Cover and refrigerate the dough for 30 minutes.
Divide the dough into 12 portions and roll each into a ball. If the dough is sticky, lightly oil your hands. Heat the oil over medium-low heat for deep-frying, and fry the dough balls, turning occasionally, until they are evenly golden brown.