Here's a process flow diagram for the cookie$-$making process specified in the case:

Cookie Dough Mixing: $-$ The process starts with mixing the cookie dough ingredients in a large mixing bowl. $-$ The ingredients, such as butter, sugar, flour, eggs, and vanilla extract, are added in the specified quantities. $-$ The mixture is creamed together using a mixer until it forms a smooth and homogeneous dough.

Cookie Rounding and Baking: $-$ The dough is rolled out on a floured surface to a desired thickness. $-$ Cookie shapes are cut out using cookie cutters, and the excess dough is gathered and re$-$rolled. $-$ The cookies are baked in the oven for a specified time until they are golden brown.

Cookie Cooling and Packaging: $-$ The cookies are removed from the oven and allowed to cool on a wire rack. $-$ Once cooled, the cookies are packaged in desired quantities for sale or consumption. Final answer: This is a simple and straightforward process flow diagram for the cookie$-$making process. The key steps involved in the process are identified, and the flow of the process is indicated by the arrows. The flow unit, which represents the specific unit of output in this process, is cookies. The process starts with mixing the cookie dough, which is then rolled out, cut into desired shapes, and baked. After baking, the cookies are cooled and packaged for sale or consumption.