McD's asks: Which came first, the chicken or the egg?

This is my favorite puzzle, and I've got to give Mickey D's a big high five for its brilliant marketing scheme to introduce the new "Southern-style" sandwich. Check out this cute video.

But I've got to point out that when it comes to the question of which came first, McDonald's swiped this sandwich from Chick-Fil-A, one of the greatest, most underappreciated chains in the US of A. 

We need Chick-Fil-A on the West Coast, and In-n-Out in the Northwest. Any other fast food wants/desires?