Place cake mix, room temperature butter, eggs and milk, pumpkin and pumpkin pie spice into mixing bowl and mix on medium speed for two minutes, scrape down sides after one minute. Stir in chocolate chips. Use a large scoop (3 Tablespoon size) it helps them to all come out in a uniform shape, into your lined cupcake pans. Bake at 325 degrees for 20 minutes. Let cool completely.