Given the task definition and input, reply with output. In this task, you have to identify the named entities (NER) which are the ingredients required given its directions. Named entities are the names of the items without their quantity.

Cream butter and add next 5 ingredients., Combine last 3 ingredients and add to mixture., Mix, if needed., Roll into balls and place on cookie sheets., Flatten with glass dipped in sugar. Bake at 400 for about 8 minutes.
butter, shortening, sugar, vanilla, eggs, milk, flour, baking soda, salt