In a large mixing bowl, whisk together the sourdough discard, milk, eggs, and melted butter until well combined.
In another bowl, mix the flour, baking powder, sugar, and salt. Make sure there are no lumps.
Gradually fold the dry ingredients into the wet ingredients, mixing gently until just combined. Do not overmix; some lumps are okay.
Heat a skillet or griddle over medium heat and grease with cooking spray or butter.
Use a ladle to pour batter onto the skillet, using about ¼ cup for each pancake.
Cook until bubbles form on the surface (about 2-3 minutes), then flip and cook for an additional 2-3 minutes on the other side until golden brown.
Repeat with the remaining batter, adding more grease to the skillet as needed.
Serve these pancakes with maple syrup, fresh fruits, or your favorite toppings.