I'm sure there are several ways. Probably the least amount of stress (to me) is a journal entry report. You would be filtering on at least three things:
1) The specific user you are filtering on, is the Edited By name.
2) The 3-letter key for your closed status goes in the "new text value" field filter.
3) since you're only looking for issues, you're looking for any issue ID that is not blank.