Product Recall: Kraft and Polly-O String Cheese and String Cheese Twists. Click here
HEAT grill to medium heat.
MIX first 4 ingredients just until blended; shape into 4 (1/2-inch-thick) patties.
GRILL 4 to 5 min. on each side or until done (160ºF). Top with cheese; grill 1 min. or until melted.
SPREAD mayonnaise onto bottom halves of buns; cover with lettuce, tomatoes, cheeseburgers and tops of buns.