In a large bowl, sift together the all-purpose flour, baking powder, baking soda, salt, and granulated sugar.
In another bowl, whisk together the sourdough starter, milk, and beaten eggs. Then add the melted butter and mix until smooth.
Pour the wet mixture into the bowl with the dry ingredients. Stir gently until just combined, being careful not to overmix.
Preheat your griddle or skillet over medium heat. Test readiness by sprinkling a few drops of water on the surface.
Scoop about 1/4 cup of batter onto the griddle for each pancake. Cook until bubbles form and edges set, about 2-3 minutes. Flip and cook for another 1-2 minutes until golden.
Serve pancakes warm, stacked high, and topped with maple syrup, fresh fruit, or whipped cream.