COOK nut mix in small nonstick skillet on medium heat 2 to 3 min. or just until nuts begin to brown, stirring occasionally. Remove from heat. Add sugar; toss until sugar is dissolved. Spread into single layer on sheet of wax paper; cool completely.
COMBINE fruit in medium bowl. Stir in sour cream; cover. Refrigerate at least 1 hour.
ADD marshmallows just before serving; mix lightly. Sprinkle with the glazed nuts.