Preheat oven to 350ºF. Place chicken breasts in a shallow baking dish just large enough to hold them. Pour half and half over them and bake for 30 minutes. Let cool and cut in 1 inch cubes. Process mayonnaise, chutney, sherry, vinegar, curry powder and turmeric in a blender or food processor. Dip chicken pieces into the curry mayonnaise and roll in the chopped nuts. Refrigerate 30 minutes. Arrange on a serving plate with fancy toothpicks.