01 - Preheat the oven to 350°F. Line an 8x8-inch baking pan with parchment paper or lightly grease it.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger until fully blended.
03 - In a large bowl, whisk pumpkin purée, maple syrup, brown sugar, oil, eggs, and vanilla until smooth and incorporated.
04 - Fold dry ingredients into the wet mixture using a spatula until just combined; avoid overmixing to maintain tenderness.
05 - Transfer batter to the prepared pan, smooth the surface, and sprinkle with chopped nuts if desired.
06 - Bake for 28 to 32 minutes, or until a toothpick inserted in the center emerges clean or with a few moist crumbs.
07 - Remove pan from oven and let cool entirely on a wire rack before slicing.
08 - Drizzle with additional maple syrup if preferred, then cut into bars.