Command line zip everything within a directory, but do not include any directory as the root

I can't find the answer to this for the life of me. Because I am packaging a zip in a specific way for a build process, I don't want to include a folder at all in the resulting zip at the root. For example, if I have this file path:

MyFolder/    A.png    B.txt    C.mp3

And I use either the command:

zip -r -X "MyFolder.zip" MyFolder/*

or

cd MyFolder; zip -r -X "../MyFolder.zip" *

I end up with a zip file that has the root element of MyFolder. What I want is for when I unzip it is to dump all of it right into the directory, like this:

A.pngB.txtC.mp3

In other words, I don't want MyFolder or any other folder as the root. I read through the whole manual and have tried numerous options and a lot of Google searching, and zip seems to just really want to have a folder at the root.

Thanks!