In a medium bowl, using an electric mixer, beat cream cheese, brown sugar and sour cream together until smooth and creamy. Fold in Cool Whip.
Place grapes in large bowl and pour dressing over grapes, gently toss together until grapes are evenly coated.
Chill for a couple hours before serving. Just before serving, sprinkle some brown sugar and chopped pecans on top.
Store leftovers in refrigerator.
Notes
You can use half red and half green grapes in this if you’d like or all of one or the other. We love it with all red grapes, but you use whatever you’d like.