Preheat oven to 350 degrees F. and spray a large loaf pan with cooking spray.
Place butter and sugar into a large mixing bowl. Mix until well combined. Add eggs and vanilla, beating until well combined. Stir in pumpkin puree until combined. Add flour, cinnamon, soda, salt and chips. Stir until combined. Transfer batter to loaf pan and top with a small handful of more mini chocolate chips. Bake for 55-60 minutes, or until bread is baked through. Check center with toothpick before removing. Let bread completely cool before transferring and cutting into slices.