PREP: Position a rack in the center of the oven and preheat the oven to 350ºF. Spray two 8 ½ x 4 ½ (or 9x5) bread pans with cooking spray, you can also line with parchment if you’d like; set aside for now.
DRY INGREDIENTS: Add the dry ingredients: flour, baking soda baking powder, all the spices, and salt to a medium bowl. Whisk to combine; set aside for now.
WET INGREDIENTS: Add the granulated sugar, brown sugar, and oil to a large bowl. Whisk to combine, then add the pumpkin puree, eggs, vanilla, and orange zest and combine to whisk until all the eggs have been incorporated into the wet batter. Don't be alarmed if the batter splits or curdles! It's totally fine!
BREAD BATTER: Add the dry ingredients into the wet ingredients in two batches, stirring just long enough so each batch of flour is incorporated. Do not over-mix or you’ll end up with dry bread!
BAKE: Divide the batter into the to pans, taking care to only fill each pan about ¾ of the way full. The bread will rise significantly! Smooth out the batter then sprinkle with the pepitas. Bake the bread for 52-62 minutes or until a toothpick inserted in the center of the loaf comes out clean. Cool the pans on a wire baking rack for at least 10 minutes before removing from the pan and allowing the bread to cool further.