Preheat the oven to 350 degrees.Put the butter in a microwave-safe bowl and cook it in the microwave until it is melted. Let it cool on the counter.In a large bowl, mix together the sugar, pureed pumpkin, eggs, vanilla, milk, cinnamon, and nutmeg.Stir in the butter and mix well.Add in the baking soda, baking powder, and salt, and flour. Stir to combine but do not overmix!Gently stir in the chocolate chips.Scoop the batter into greased or paper-lined cupcake liners.Cook at 350 degrees for 15-20 minutes.ENJOY!