Preheat your oven to 350°F and line an 8x8-inch baking pan with parchment paper for easy removal. This prevents sticking and makes cleanup wonderfully simple every time.

Whisk together all-purpose flour, baking powder, pumpkin pie spice, salt, nutmeg, ginger, and cinnamon in a medium bowl. Set the dry mixture aside while you prepare the wet ingredients.

Beat softened butter and brown sugar together until light and fluffy, about 2-3 minutes using an electric mixer. This creaming process incorporates air and creates the signature tender texture.

Add pumpkin puree, egg, and vanilla extract to the butter mixture and blend until completely combined. Beat for approximately 1 minute until the batter appears smooth and evenly mixed throughout the pumpkin spice blondies recipe base.

Fold the dry ingredients into the wet mixture using a spatula, stirring until just combined without overmixing. Gently fold in white chocolate chips and chopped pecans to distribute throughout.

Pour batter into the prepared pan and spread evenly across the bottom using an offset spatula. Bake for 22-25 minutes until a toothpick inserted in the center comes out with just a few moist crumbs.

Allow the pan to cool completely on a wire rack before cutting into 12 squares. This cooling time ensures fall blondies hold their shape perfectly when sliced.