Preheat your oven to 350 degrees F. Line a loaf pan with parchment paper and set aside.
In a large bowl, whisk the 2 eggs ½ cup granulated sugar and ¾ brown sugar together until the eggs and the sugars lighten in color and start to fluff up.
Stir in the can of pumpkin purée, ½ cup oil, and 1 ½ teaspoons of vanilla extract until smooth.
In a separate bowl, mix the dry ingredients, whisking together the 1 ⅓ cups flour, 1 teaspoon of baking soda, ½ teaspoon baking powder, ½ teaspoon of salt, and spices (2 teaspoons cinnamon, ½ teaspoon ground ginger, ¼ teaspoon nutmeg, and if you’d like ¼ teaspoon ground cloves or allspice). Whisk in the chocolate chunks.
Gently fold dry ingredients into wet ingredients just until incorporated. The batter should be thick but pourable. If it’s too thick, stir in 1-2 tablespoons of milk or water.
Pour the pumpkin bread batter into a prepared pan, smooth top, sprinkle a handful of chocolate chips over the top.
Bake for 45–55 minutes, or until a toothpick inserted in the center comes out clean (a few crumbs are okay). Start checking at the 40 minute mark. Ovens can sometimes run cool or hot.
Cool for 10 minutes before slicing and serving warm or at room temperature.