In a large bowl, combine theflour, brown sugar, baking powder, baking soda, salt, cinnamon and pumpkin pie spice.
In a separate medium-sized bowl, whisk together the pumpkin purée, buttermilk, melted butter, eggs and vanilla.
Pour the wet ingredients into the dry ingredients and use a spatula to gently mix them until just combined.
Meanwhile , let’s make the cinnamon swirl mixture. In a small bowl, add in the butter, sugar, cinnamon and 1 tablespoon of the pancake batter. Transfer this mixture into a small plastic piping bag and snip a small portion off one corner of the bag.
Heat a large skillet over medium heat and generously grease it with butter.
Use a ¼ measuring cup to pour the pancake batter onto the skillet for each pancake.
Take the plastic bag filled with the cinnamon swirl and trace a swirling pattern into the pancake batter. Gently push it into the batter so that the cinnamon mixture beautifully blends within the pancake, not just on top.
When bubbles start appearing on the surface, carefully flip the pancake over and cook the other side for about a minute or until it achieves a lovely pancake batter and the cinnamon swirl mixture.
Serve the warm pancakes with your choice of additional butter, maple syrup or any type of topping you prefer!