Grape Walnut Salad

8 oz cream cheese
8 oz sour cream
1 tsp vanilla extract
1/2 cup sugar
4 lbs red grapes
1 TBS butter
1 cup walnuts
1/2 cup brown sugar

**mix cream cheese, sour cream, vanilla and white sugar. Fold grapes into mixture. In saucepan melt butter, add walnuts and stir to coat. Remove from heat, stir in brown sugar. Sprinkle over grapes.