I have created a management page for my php site. I have a management page that I created that I would like to secure (allow only me to access).

What is the easiest way to secure this page without creating a full fledged login system? This feels like overkill, and I am afraid of creating security vulnerabilities. I have no other needs for a login system for the rest of the site.

Any recommendations or ideas from other people that have done stuff like this?