Whisk the flour, baking powder, baking soda, salt, and pepper with 2 cups (480 ml) water in a medium bowl until smooth. Fold in the scallions.
Heat the oil in a large sauté pan over medium-high heat. Working in batches, pour ½ cup (120 ml) of the batter in the pan for each pancake and cook until golden brown, about 4 minute