I decided upon the Whataburger patty melt instead of their classic burger because I had texas toast on hand. It was a success. 4.5 stars out of 5 from Tim and I. I liked it so much I made it a second time.
I had to buy several of the sauce ingredients at the local store. Walmart did not carry the chilies so I had to make a second stop at Ingles.
Here is the recipe I followed: https://copykat.com/whataburger-patty-melt/
I am becoming a pro at making carmelized onions. They make all the difference in taste.