01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing an overhang for easy removal.
02 - In a large bowl, whisk together melted butter, brown sugar, and maple syrup until the mixture is smooth.
03 - Add the egg, pumpkin purée, bourbon, and vanilla extract to the wet mixture, whisking until thoroughly combined.
04 - In a separate bowl, combine flour, cinnamon, ginger, nutmeg, cloves, baking powder, and salt. Stir until evenly distributed.
05 - Gradually stir the dry ingredients into the wet ingredients, mixing only until just incorporated. Avoid over-mixing.
06 - Gently fold in pecans and white chocolate chips, if using.
07 - Spread the batter evenly into the prepared pan. Bake for 32 to 35 minutes, until edges are set and a toothpick comes out with a few moist crumbs.
08 - Allow to cool completely in the pan. Lift blondies out using the parchment overhang, then cut into 16 squares.