In a large mixing bowl, whisk together the sifted flour, brown sugar, baking powder, cinnamon, nutmeg, and salt until evenly combined.
In a separate bowl, whisk the milk, pumpkin puree, vegetable oil, and vanilla extract until smooth and well blended.
Pour the wet ingredients into the dry mixture and gently fold together using a spatula, just until combined. The batter should be slightly lumpy but without streaks of dry flour.
Preheat a griddle or non-stick skillet over medium heat. Lightly grease with butter or spray and wait until it’s hot but not smoking.
Pour about 1/4 cup of batter onto the hot skillet for each pancake, allowing space between each for spreading. Cook until bubbles form across the top and the edges look set, about 2-3 minutes.
Carefully flip the pancakes with a spatula and cook for another 2 minutes, until golden brown and cooked through.
Transfer the cooked pancakes to a plate and keep warm. Repeat with the remaining batter, adjusting heat as needed to prevent burning.
Serve the fluffy pumpkin spice pancakes warm, topped with syrup, fruit, or nuts for extra flavor and texture.