Preheat oven to 350°F. Grease a 9x5-inch loaf pan with melted butter and line with a parchment sling.
Whisk flour, baking soda, baking powder, salt, cinnamon, and pumpkin pie spice in a medium bowl.
In a large bowl, whisk pumpkin puree, oil, beaten eggs, vanilla, granulated sugar, and brown sugar until smooth.
Add dry ingredients to the wet mixture. Stir gently until no dry spots remain; avoid overmixing.
Fold in most of the chocolate chips, keeping a tablespoon aside for the top.
Scrape batter into the prepared pan, smooth the surface, and sprinkle on the reserved chips.
Bake 52–58 minutes, until a tester comes out mostly clean with a few moist crumbs.
Cool in the pan for 15 minutes. Lift out, transfer to a rack, and cool completely before slicing.