Adding peaches to a sandwich creates a sweet, moist and fat-free layer. In place of layering, mix the ingredients for a salad-style filling. Ciabatta is an Italian bread with a soft interior and a crisp, thin crust; its name means “slipper” in Italian, referring to the loaf’s shape.
In medium bowl, whisk yogurt, mint, basil, sugar, onion, salt and pepper; cover and refrigerate 30 minutes.
Cut loaf lengthwise.
Layer lettuce along length of bottom slice; repeat with chicken, peaches and avocado.
Spread yogurt mixture on cut side of top slice; place top slice over layered filling.
Cut loaf into four pieces.