Gather all ingredients.
Combine sourdough starter, milk, egg, and oil in a bowl,
Whisk flour, sugar, baking powder, baking soda, and salt together in a separate bowl.
Stir in sourdough starter mixture until just combined; some lumps are okay.
Lightly coat a griddle with cooking spray; heat over medium-high heat. Drop batter by ¼ cupfuls, in batches, onto hot griddle. Cook until bubbles form and edges are dry, about 2 minutes.
Flip and cook until golden brown, another 2 to 3 minutes. Repeat with remaining batter.
