Add the pancake mix, baking powder, and pumpkin spice to a large bowl and whisk to combine.
Add the pumpkin puree, water, brown sugar, and vanilla to a medium bowl and whisk to combine.
Add the wet ingredients to the dry ingredients and stir until just combined. Be careful not to overmix the batter. Let the batter rest for 5 to 10 minutes.
While the batter rests, preheat your griddle to 350℉ or set a large non-stick skillet over medium heat and coat it with melted butter or cooking spray.
Using a ⅓ cup dry measuring cup, scoop the batter and drop it onto the griddle. Cook for 2-3 minutes, until the batter is set and bubbles begin to form on the surface.
Flip and cook for another 1-2 minutes until cooked through. Repeat with the remaining batter. Top with butter, chopped pecans, and maple syrup, then serve immediately.
Notes
Store in an airtight container and refrigerate for up to 3 days. Reheat in the toaster oven or microwave until warmed through. Pumpkin pancakes can be frozen for up to 3 months.