Hi, again. Many people swear by TMP luster powders; I sometimes use Chef Rubber powders extended with vodka, and they are super shiny. However, please read product labels - most gold lusters (including these, I believe) are not FDA-approved and really are only intended for decoration, not eating.
You should also check this link on our site (https://cookieconnection.julia...agination.sort=SCORE). I did a search for all topics related to gold luster, as I believe this question, or others very related to it, have already been asked and answered on this site. If you click on that link, you'll see the topics/threads that came up in that search.
Hope this helps. And hopefully others will chime in too.