Melt butter and then let cool. Preheat a griddle or skillet to medium heat. Mix together the butter, eggs, milk, pumpkin, and vanilla and whisk together. In a separate bowl, whisk together the flour, white sugar, baking powder, baking soda, pumpkin pie spice and salt. Pour wet ingredients over the dry and stir to incorporate. Don't overmix. Let batter sit for 5 minutes.