HEAT oven to 425ºF.
MIX cream cheese and peppers until blended.
TOP each chicken breast with 1 Singles piece. Spread with cream cheese mixture; roll up. Place, seam sides down, in 13x9-inch baking dish sprayed with cooking spray; top with spaghetti sauce. Cover.
BAKE 20 min. or until chicken is done (165ºF). Top chicken with remaining Singles pieces; bake, uncovered, 3 to 5 min. or until melted.