HEAT oven to 350°F.
MIX first 4 ingredients; spread onto tortillas. Top each with 1 Singles half and wiener; roll up.
PLACE, seam-sides down, in 13x9-inch pan; cover.
BAKE 20 to 25 min. or until heated through. Spoon taco sauce over tortillas; top with remaining Singles halves. Cover. Bake 5 min. or until Singles begin to melt. Top with sour cream and onions.