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.

Preheat oven to 350 degrees F., cream soft butter in mixing bowl., add cornstarch and powdered sugar., blend well., add flour and salt., cream well., I chill the dough for about 1/2 hr to an hour., use a cookie scoop and space about 1 " apart., bake 15 approximately minutes -- until edges are golden., let cool well before removing from cookie sheet., Makes 20 cookies.
powdered sugar, cornstarch, flour, butter, salt, vanilla