In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, spices, and salt until well combined.
In a separate bowl, blend the pumpkin puree, buttermilk, eggs, maple syrup, and melted butter until smooth and homogenous.
Pour the wet mixture into the dry ingredients and gently fold them together with a spatula until just combined; avoid overmixing to keep the pancakes fluffy.
Preheat your griddle or skillet over medium heat until it is hot but not smoking, and lightly grease with butter or oil.
Pour about 1/4 cup of batter for each pancake onto the hot surface, and cook until bubbles form on the surface and the edges look set, about 2-3 minutes.
Flip the pancakes carefully with a spatula, and cook for another 2 minutes or until golden brown and cooked through.
Transfer the cooked pancakes to a plate and repeat with the remaining batter, adjusting heat as necessary to prevent burning.
Serve the pancakes warm, topped with toasted pecans and a drizzle of maple syrup for a cozy autumn flavor.