Berry Grape Chicken Salad

1 c. red seedless grapes, sliced in half
1 c. green seedless grapes, sliced in half
1/2 c. fresh blueberries
1 c. fresh raspberries
1 red apple, cored, cut into 1/2” chunks
2 c. cooked chicken, in chunks
3 ribs celery, chopped
1 c. walnuts, coarsely chopped
2 c. vanilla or lemon yogurt

In large bowl combine all ingredients and mix gently until everything is evenly coated. Serve on individual plates or a serving platter lined with leaf lettuce.