Never been there, never did that.
I see you don't have any replies, as yet, so use your search engine and enter:
Fast food restaurants in Louisville KY
Being there are so many I will let you check them out. The only other suggestion is to ask someone in Louisville, postman, policeman, etc. on which one they would recomment. You might also try the same search engine by leaving the word "fast" out. Or change to "good", etc.