Place butter in a light-colored skillet over medium heat. Stir continuously until it foams and milk solids turn golden. Remove from heat and cool completely.
Preheat oven to 350°F. Line a 9×5-inch loaf pan with parchment and spray with non-stick spray.
In a large bowl, whisk flour, baking soda, salt, and pumpkin pie spice.
In another bowl, combine pumpkin, eggs, cooled brown butter, water, sugar, and vanilla.
Pour wet mixture into dry and stir gently until just combined. Fold in chocolate chips.
Transfer batter to prepared pan and top with extra chocolate chips.
Bake for 1 hour 15 minutes, or until a toothpick comes out clean.
Cool completely in the pan before slicing.