To a large mixing bowl, add your butter and sugar and whisk them together. Add your sourdough discard and whisk again till smooth. Add your eggs, vanilla and 1 cup of milk and whisk till well combined.
To the same bowl, add your flour, baking powder, baking soda and salt and whisk together till you have a thick pancake batter. Add 1-4 tbsp of milk, and whisk into the batter till it's reached your desired consistency.
Preheat a large pan (or skillet) to medium heat.
After hot, add large spoonfuls of pancake batter onto your pan. Cook for a couple minutes, until you start to see little bubbles forming. Then flip your pancake to the other side, and cook on the other side for a couple minutes till cooked through. Continue till all of your pancakes have been cooked through.
Devour!
Stored in an airtight container in the fridge these pancakes taste best within 4-5 days. You can also freeze them for up to 2 months.