In a medium bowl whisk together the unfed sourdough starter, milk of choice, all purpose flour and honey until thoroughly combined. Cover with plastic wrap and leave at room temperature on the counter until the next morning. In the morning you will notice some bubbling. This is normal.
Into the bowl with the sourdough starter, whisk the remaining ingredients: melted butter, vanilla, egg, salt, baking powder, baking soda and salt. Mix until just combined. The batter will be thick.
In a medium cast iron skillet or non stick pan, melt 2 tablespoons of butter until nice and bubbly. Add about ⅓ cup of batter to the skillet (batter will be thick), and cook until bubbles appear and the bottom is a nice golden brown, about 2 minutes. Flip. Repeat with the remaining batter adding more butter to the pan as necessary. Serve topped with warm maple syrup. Enjoy!
