Chicken Pasta Salad in Creamy Curry Dressing

1 whole skinless boneless chicken breast (about 3/4 pound), poached and cut into bite-size pieces (about 1 1/2 cups)

5 cherry tomatoes, quartered

2 scallion s, sliced thin

1 tablespoon finely chopped fresh basil leaves For the dressing

1/2 teaspoon minced garlic

1 teaspoon minced peeled fresh ginger root

1 tablespoon unsalted butter

1/4 cup heavy cream

1 tablespoon white- wine vinegar

3/4 teaspoon curry powder

dried hot red pepper flakes to taste

1 tablespoon finely chopped drained bottled mango chutney, or to taste