In a large mixing bowl, whisk together the flour, brown sugar, baking powder, baking soda, pumpkin pie spice, and salt until evenly combined.
In another bowl, combine the pumpkin puree, milk, egg, and melted butter. Mix well until combined.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Don’t overmix; it's okay if there are a few lumps.
Heat a frying pan or griddle over medium heat. Add a small amount of butter or oil to coat the surface.
Use a ladle to pour about ¼ cup of the batter for each pancake onto the hot surface.
Cook for 2-3 minutes, or until bubbles form on the surface and the edges look set. Flip the pancakes and cook for another 2-3 minutes, until golden brown.
Remove pancakes from the pan and keep warm while preparing the rest.
Serve warm with maple syrup, whipped cream, or your favorite toppings.