Step 1: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan or line it with parchment paper for easy removal.
Step 2: In a medium bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, baking soda, salt, cinnamon, nutmeg, ginger, and cloves until well combined.
Step 3: In a large bowl, beat the eggs, vegetable oil, pumpkin puree, and vanilla extract until smooth and creamy.
Step 4: Gradually add the dry ingredients to the pumpkin mixture, stirring just until the flour disappears. Do not overmix.
Step 5: Spread the batter evenly into the prepared baking pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean.
Step 6: While the bars are cooling slightly, melt the butter in a small saucepan over medium heat. Stir in the maple syrup and powdered sugar, whisking until the glaze is smooth and thickened.
Step 7: Pour the warm maple glaze over the bars while they are still slightly warm and spread it to the edges with a spatula.
Step 8: Allow the maple glazed pumpkin bars to cool completely and for the glaze to set before cutting into 16 squares and serving.