In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and brown sugar until evenly combined. Set aside.
In a separate large bowl, stir together the pumpkin puree, milk, egg, and melted butter until smooth and fully combined.
Pour the dry ingredients into the wet mixture. Stir just until combined - don't overmix, or your pancakes may get too dense.
Preheat a non-stick skillet or griddle over medium heat. Lightly grease with butter or cooking spray.
Use a small ladle or cookie scoop to drop 3–4 inch rounds of batter onto the skillet. Cook for 2–3 minutes on the first side, until bubbles form and the edges look set.
Flip the pancakes carefully and cook for another 2–3 minutes, or until golden brown and cooked through.
Plate them up while they’re still hot, pour over some maple syrup, top with a cloud of whipped cream, and scatter walnuts for the perfect bite. Enjoy!