Tomatoes with green chiles. You may find them with Mexican Food or international foods if they are not by the canned tomatoes.
Whoops, saw this after. Darren, if you don’t want the carbage & additives in Velveeta (it’s not so much that I don’t indulge occasionally), make queso with sodium citrate and use the rotels for the liquid to dissolve it in. You can really crank up the flavor with whatever is your favorite cheese.