Add the dry ingredients to a large mixing bowl and whisk them together until evenly combined. Set aside.
2 cups flour, 3 tbsp brown sugar, 2 tsp baking powder, 1 tsp baking soda, 2 tsp pumpkin pie spice, 1/2 tsp ground cinnamon, 1/2 tsp salt
Add the wet ingredients to a separate mixing bowl and whisk them together until evenly combined.
1 1/2 cups milk, 1 cup pumpkin puree, 1 large egg, 2 tbsp canola oil, 2 tbsp white vinegar, 1 tsp vanilla extract
Add the wet ingredients to the dry bowl and whisk everything together until evenly combined. Some small lumps may remain, and that's ok because you don't want to overmix the batter.
Once the pan's hot and the butter's melted scoop ladles of batter onto the pan, 2 -3 at a time as space permits without overcrowding and allowing for spreading.
Cook for roughly 3 minutes, until bubbles almost stop forming on top. Flip and continue cooking for 2 more minutes.
Transfer the cooked pumpkin pancakes to a waiting serving plate, and continue until all have been made.
Serve warm with whipped cream, butter, and/or syrup, if desired.