Combine the pancake mix, brown sugar, baking powder, pumpkin pie spice, and ground cinnamon in a large bowl.
Whisk together the pumpkin, milk, eggs, and vanilla in a separate medium bowl or liquid measuring cup.
Add the wet ingredients to the dry ingredients, mixing just until the batter is combined.
Heat a large griddle over medium high heat. Add a little butter until melted.
Spoon the batter in ¼-cup rounds onto the hot griddle and cook until bubbles form around the edges. Flip and cook on the other side. Serve warm with maple syrup.