Place 2 tortillas on work surface, with edges slightly overlapping, to form 9-inch length. Spoon 1/3 cup chicken down center; roll up, starting at one long side. Repeat with remaining tortillas. Secure each with 2 wooden toothpicks, inserting 1 toothpick about 3 inches from each end.
Heat oil in large skillet on medium-high heat to 375ºF. Add flautas, in batches; cook 4 min. or until crisp and golden brown, turning once. Remove from skillet; drain on paper towels. Discard toothpicks. Place flautas on platter.
Tear Singles into strips; place in microwaveable bowl. Add milk. Microwave on HIGH 1 min. or until Singles are completely melted and sauce is smooth, stirring every 30 sec. Pour over flautas; top with cabbage and salsa.