Step 1: Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan or line it with parchment paper.
Step 2: In a medium bowl, whisk together the flour, baking soda, baking powder, cinnamon, ginger, cloves, and salt until well combined.
Step 3: In a large mixing bowl, beat the eggs, granulated sugar, brown sugar, oil, and pumpkin puree until the mixture is smooth and light.
Step 4: Gradually add the dry ingredients to the pumpkin mixture, stirring gently until just combined. Do not over-mix.
Step 5: Spread the batter evenly into the prepared baking pan using a spatula to smooth the surface.
Step 6: Bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Remove from the oven and let cool slightly on a wire rack.
Step 7: To make the glaze, melt the butter and maple syrup in a small saucepan over medium heat until it begins to simmer.
Step 8: Remove from heat and whisk in the powdered sugar and vanilla extract until the glaze is completely smooth.
Step 9: Pour the warm glaze over the slightly warm pumpkin bars, spreading it to the edges. Allow the glaze to set completely before slicing into bars.