In a large bowl, mix together the sourdough starter, flour, and milk.
Cover and let it sit at room temperature for about 8 hours or overnight. This will give your pancakes a nice tangy flavor.
When you're ready to make the pancakes, whisk in the egg, sugar, melted butter or oil, baking soda, salt, and vanilla extract (if using) until the batter is smooth and well combined.
Heat a non-stick skillet or griddle over medium heat.
Lightly grease with butter or oil.
Pour about 1/4 cup of batter onto the skillet for each pancake.
Cook until bubbles form on the surface and the edges look set, then flip and cook until golden brown on the other side.
Keep the cooked pancakes warm in a low oven or cover with a clean towel while you finish cooking the rest of the batter.
Serve your sourdough pancakes with your favorite toppings like maple syrup, fresh berries, or whipped cream.
Keep cooked pancakes warm in a low oven or cover them with a clean towel until you’re ready to serve.