In a large mixing bowl, add the flour, baking soda, baking powder, salt and sugar. Whisk until evenly combined.
Next, add the sourdough starter, egg, milk, and vegetable oil. With a mixing spoon, mix well just until combined. Do not over-mix as it will change the texture of your sourdough pancakes.
Over medium heat, set a non-stick pan or griddle on the stove and lightly grease with butter. Using a ladle or measuring cup, pour 1/4 cup scoops of pancake batter onto your hot pan. Cook for about 1-2 minutes until you start to see bubbles form on the surface and the bottom is golden brown. Flip your pancake using a spatula and cook the opposite side for another 1-2 minutes until golden brown on both sides.
Serve immediately with your favorite pancake toppings. Maple syrup, powdered sugar, butter, whipped cream, and/or fresh berries are all great options!