Preheat oven to 350°F and spray an 8 inch baking pan with cooking spray or line with parchment paper.: When you start with a properly heated oven the bars rise and set correctly, creating even browning across the surface and edges. You'll notice a warm, toasty smell when the oven reaches temperature, and the air in the kitchen will feel cozy. Preparing the pan with cooking spray or a parchment sling prevents sticking so the bars release cleanly, which is important because they are moist and can cling to the pan. A common mistake is skipping the parchment, which can tear the bars when removing them; take an extra minute here, it pays off when slicing.
Cream together butter and sugar.: As you beat softened butter with brown sugar , you will see the mixture lighten in color and become fluffy; this means air has been incorporated, helping a tender crumb. The texture should be smooth with no visible granules of sugar remaining, and you should hear a gentle, consistent mixing sound from your mixer. If the butter is too cold, it will not cream properly, leaving a greasy or dense batter. Scrape the bowl occasionally to ensure everything blends evenly.
Beat in pumpkin, ginger, maple syrup and maple flavor.: Adding the pumpkin and flavorings creates a thick, fragrant batter; you'll pick up a sweet, earthy aroma from the pumpkin and a bright, spicy note from the ginger . The batter will look moist and slightly glossy thanks to the maple syrup , and the color will deepen to a rich autumn hue. A common pitfall is overbeating after adding the pumpkin , which can make the texture gummy; mix just until combined.
Sift together dry ingredients and stir into wet ingredients.: When you sift the flour , ground ginger , pumpkin pie spice , baking soda , and salt , the dry mix becomes airy and free of lumps, ensuring even distribution of leavening. Folding these into the wet mixture with a spatula preserves the air from creaming, which keeps the bars light. You should see a uniform batter with no streaks of dry flour . Avoid vigorous stirring, which can develop gluten and result in a tough bar.
Pour into prepared pan and bake for 25-35 minutes or until toothpick inserted into the center comes out clean.: As the pan goes into the oven the batter puffs slightly and a warm, spiced aroma fills the kitchen. Watch for golden edges and a slight spring to the touch in the center; the surface should be set and lightly browned. The toothpick test is the best indicator, a few moist crumbs are fine, but batter shouldn't cling. A common error is underbaking to preserve moisture, which can leave an overly gooey center, so err on the side of a few extra minutes while watching carefully.
Cool on a wire rack and cut into 12 bars.: Allowing the bars to cool on a wire rack ensures air circulates underneath so they set evenly and the glaze later adheres nicely. Cooling fully makes slicing neater; the bars firm up and the crumb binds together. If you cut while too warm, the bars may crumble or the glaze can melt into the surface. Use a sharp knife and wipe it between cuts for clean edges.
Combine glaze ingredients starting with two tablespoons of milk and adding until you reach your desired consistency.: Mixing powdered sugar , maple extract , maple syrup , and milk produces a silky glaze that should be glossy and pourable. Start with two tablespoons of milk and whisk; the glaze will smooth out, and you can add one more tablespoon if needed to attain a drizzling texture. Watch for lumps from the powdered sugar , and whisk until smooth. Adding too much milk at once can make a runny glaze; add slowly and adjust.
Drizzle glaze over bars.: When you drizzle the glaze, it should form thin ribbons that set into a delicate sheen on the bars, adding sweetness and a maple aroma. Use a spoon or a piping bag for control, and work quickly before the glaze starts to set. The visual is important, a neat drizzle elevates presentation. A common mistake is pouring hot glaze; ensure it is room temperature so it does not melt into the bars and lose that pretty finish.