Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking dish or line it with parchment paper.
Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, cinnamon, nutmeg, ginger, cloves, and salt. Set aside.
Combine Wet Ingredients: In a large bowl, whisk together the melted butter, brown sugar, and granulated sugar until smooth. Add the egg and vanilla extract, and whisk until fully combined. Stir in the pumpkin puree until the mixture is smooth and well combined.
Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Do not overmix.Fold in 1 cup of the chocolate chips, reserving the remaining 1/2 cup for topping.
Bake: Pour the batter into the prepared baking dish, spreading it evenly with a spatula. Sprinkle the remaining 1/2 cup of chocolate chips evenly over the top. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
Cool and Serve: Allow the bars to cool completely in the baking dish on a wire rack. Once cooled, cut into squares and serve.