In a large bowl, whisk the dry ingredients together until there are no lumps.
In another bowl, combine pumpkin purée, maple syrup, milk, egg, and melted butter. Mix well.
Pour the wet ingredients into the dry ingredients and stir until just combined. If the batter seems too thick, you can add a splash of milk to thin it out. Avoid overmixing to keep pancakes fluffy.
Heat a griddle or skillet over medium-high heat and lightly coat with cooking spray.
Pour 1/4 cup of batter for each pancake and cook until bubbles form on the surface, about 2 minutes. Flip and cook until golden brown, about 2 more minutes.
Serve with butter and additional maple syrup on top.