Fiesta Chicken con Queso is a fiesta for your tastebuds. Just a little zippy and a whole lotta yum. It was easy, too, because we used prepackaged fajita veggies, southwestern cheese sauce from a jar and freshly made salsa fresca from our local supermarket.  We stuffed it with shredded  mozzarella cheese, but you can use any shredded cheese you like. And seasoned with Chef…