Preheat oven to 350 degrees F.
Spray a 9x5" loaf pan with cooking spray.
In a large bowl, combine pumpkin, eggs, coconut oil, milk, brown sugar, and vanilla, and whisk together until well combined.
In a separate bowl, mix together flour, pumpkin pie spice, baking powder, baking soda, and salt.
Add dry ingredients to wet ingredients and stir together with a spatula until just combined.
Fold in chocolate chunks.
Pour into prepared loaf pan.
Bake in preheated oven for 55-60 minutes until center springs back lightly when touched.
Cool and slice.