2 tablespoons nonfat mayonnaise |
1 tablespoon dijon mustard |
1 1/2 teaspoons balsamic vinegar |
1/2 teaspoon minced garlic (about 1 clove) |
1 (16-inch) french baguette, split lengthwise |
1 cup loosely packed fresh basil leaves |
12 ounces boneless, skinless roasted chicken breast, sliced |
1/2 cup very thinly sliced purple onion, separated into rings (about 1/2 small onion) |
3 ounces thinly sliced part-skim mozzarella cheese |