The evening before (or approximately 8 hours before) you are ready to bake, mix together the flour, sugar, milk and sourdough starter in a large mixing bowl.
Cover the bowl and place in the refrigerator overnight.
The next morning, add the salt, baking powder, eggs, and melted butter to the mixture and stir to fully incorporate.
For pancakes, pour 1/4 - 1/2 cup of batter onto a heated griddle (set to approximately 325 degrees F). Bake for 1-2 minutes per side or until golden brown.
For waffles, pour 1/4 - 1/2 cup of the batter into a waffle iron, close the lid and bake for about 1-2 minutes or until golden brown.
Serve plain or with your favorite topping and enjoy!