The most common type of cookie?

That's a tricky question! It depends on how you define "most common."

Here are some possibilities:

* By production volume: It's likely chocolate chip cookies are the most common, given their popularity and widespread production.

* By household baking: Sugar cookies are often considered the most common because they are simple to make and versatile for decorating.

* By global consumption: Biscuits (a type of cookie) are incredibly popular worldwide, especially in Europe and Asia.

Ultimately, the "most common" type of cookie is subjective and depends on the specific criteria used.