Muffaletta Casserole with olive brine vinaigrette Recipe

Ingredients

• 1 cup pitted mixed olives, drained (reserve ¼ cup brine) and chopped
• ¼ cup sherry or cider vinegar
• 1 Tbsp. Dijon
• 1 ½ tsp. minced garlic
• ⅓ cup olive oil
• 4 cups focaccia cubes (1-inch)
• 1 jar giardiniera (16 oz.), drained
• 3 oz. coppa ham, chopped
• 3 oz. Genoa salami, chopped
• 2 oz. mortadella or bologna, chopped
• 1 ½ cups shredded Italian blend cheese, divided
• ½ cup shredded Parmesan
• Sliced pepperoncini, optional