Stir together flour, sugar, baking powder, and salt in a large bowl. In another bowl, combine egg, buttermilk, and oil; add all at once to flour mixture. Stir just until dry ingredients are moist- do NOT overmix! There should be plenty of lumps in the batter. Fry by the 1/4 cup on a greased griddle or skillet on medium high heat. If using blueberries, sprinkle onto pancakes just after pouring the batter onto the griddle.
*Note: if you don't have buttermilk, you can substitute plain yogurt (if using greek yogurt, thin with a little water before adding to the flour mixture).