In a small bowl, combine salsa, chiles and taco seasoning; let stand 5 minutes. Butter one side of each slice of bread. Spread salsa mixture on the non-buttered side of 4 slices of bread; top with 1/4 cup Wisconsin queso quesadilla cheese. Cover with remaining 4 slices of bread, buttered side out.
Place sandwiches on an electric griddle heated to 275°F, or in a skillet over medium heat. Cook 4-5 minutes per side, or until bread is golden brown, and cheese is melted.
*You may substitute another Hispanic melting cheese such as asadero, queso oaxaca or monterey jack.