Go back to where you saw "remid cookie." Was it a Reddit post, a Tumblr CC download, or a YouTube thumbnail? Check for typos—the creator may have meant Remi D. (a user name) or Remix’d Cookie .
Here is the information you likely need: the+sims+4+remid+cookie
If you cannot find the cookie via Debug cheats, or if the search for "the sims 4 remid cookie" brought you here hoping for a downloadable file, you are in luck. The modding community has created dedicated versions. Go back to where you saw "remid cookie