Beat the butter until creamy (approx. 30 seconds).
Add the sugars, and beat 3 - 4 minutes until light and creamy.
Add eggs one at a time.
Add pumpkin puree, blending on low speed just until combined.
Mix the milk and vanilla together in a separate bowl.
Sift the flour, baking powder, baking soda, and spices over the pumpkin mixture.
Mix the flour and pumpkin mixtures together, gradually pouring in the milk and vanilla. Mix just until well blended, scraping the sides of the bowl as necessary.
Stir in the chocolate chips.
Spread batter into pan(s).
Loaves take about 60 minutes to bake. I suggest starting the checking for little loaves at around 50. They're done when a toothpick inserted in the middle comes out clean.