these aren't right, but they're a place to start

http://www.houstonfoodexplorers.com/2017/05/tex-mex-felixs-chile-con-queso-recipe.html 

https://www.woodland-heights.org/news/2018/8/28/recipe-felix-mexican-restaurant-chile-con-queso

http://bestcookideas.com/mexican/9987-felix-mexican-restaurant-queso-recipe.html