Remove all the grapes from the stems. Rinse with cold water and put in a large serving bowl.
In a smaller bowl, mix together the softened cream cheese, sour cream and 1/2 cup of the brown sugar. When smooth, pour over the grapes.
Mix the cream cheese dressing into all the grapes. Sprinkle the remaining, 1/4 cup brown sugar over the top of the salad.
Serve immediately or keep in the refrigerator until ready to serve.
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Notes
Storage: Refrigerate in an airtight container for up to 3–4 days. Stir before serving. Do not freeze.Make-ahead tip: Prepare the salad up to 24 hours in advance. Add nuts and the brown sugar topping just before serving to keep them from getting soggy.For best results: Dry the grapes completely after rinsing and use full-fat cream cheese at room temperature for the smoothest dressing.