Brown the butter. Melt the unsalted butter in a small skillet over medium heat. Once melted, stir constantly. It will foam, then brown bits will form on the bottom. When it smells nutty and turns caramel-colored, pour it straight into a heat-safe bowl. Set aside to cool.
Preheat the oven to 350°F. Line a 9x5 loaf pan with parchment paper, leaving overhang on the sides for easy lifting.
In a large bowl, whisk together the pumpkin puree and eggs until smooth.
Add the granulated sugar, brown sugar, and cooled browned butter. Whisk until combined and no streaks remain.
In a separate bowl, whisk together the flour, cinnamon, ginger, nutmeg, cloves, allspice, baking soda, and salt.
Add the dry ingredients to the wet ingredients. Stir until a thick batter forms and the flour just disappears. Do not overmix.
Fold in 1 ¼ cups of the chocolate chips. Reserve the remaining ¼ cup.
Scrape the batter into the prepared loaf pan and spread it even. Scatter the reserved chocolate chips across the top.
Bake for 50 to 60 minutes, until a toothpick inserted into the center comes out clean or with a few moist crumbs. Check at 45 minutes. If the top is browning too quickly, loosely tent the loaf with foil and continue baking.
Let the loaf cool in the pan for 10 minutes. Use the parchment overhang to lift it out and transfer to a wire rack.
Cool completely before slicing.
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Notes
Brown the butter first so it has time to cool. Pour it out as soon as it turns caramel-colored.
Use individual spices, not pumpkin pie spice. The balance is better.
Do not overmix. Stir until just combined. A few flour streaks are fine.
Check at 45 minutes. Ovens vary. The toothpick test tells the truth.
Cool completely before slicing or the loaf will crumble.
Store sliced and individually wrapped in plastic wrap at room temperature. Freezes for up to 2 months.