Green Goddess Chicken Salad

Name: Green Goddess Chicken Salad
Ingredients: 2 oil-packed anchovies, drained; 1 small garlic clove; 1/2 cup packed flat-leaf parsley leaves; 1/4 cup packed basil leaves; 1/4 cup coarsely chopped dill; 1 tablespoon oregano leaves; 3/4 cup mayonnaise; 2 1/2 tablespoons fresh lemon juice; 2 tablespoons snipped chives; Kosher salt and freshly ground pepper; One 1-pound loaf of ciabatta—bottom crust reserved for another use, bread cut into 1-inch cubes; One 2-pound rotisserie chicken—skin and bones discarded, meat pulled into large bite-size pieces; 8 piquillo peppers (from a 9.8-ounce jar), drained and quartered lengthwise; 3 inner celery ribs with leaves, thinly sliced; 1/2 cup pitted kalamata olives, halved