Grilled Chicken Chopped Salad with Italian Dressing

Dressing

• 1/2 cup light mayonnaise
• 1/4 cup olive oil
• 3 Tbsp white vinegar
• 3 Tbsp water
• 1/4 cup finely grated Parmesan cheese
• 1 Tbsp fresh lemon juice
• 1 Tbsp finely minced fresh parsley
• 1 Tbsp granulated sugar
• 1 1/2 tsp Italian seasoning
• 1 large clove garlic, minced
• Salt and freshly ground black pepper

Salad

• 1 1/4 lbs boneless skinless chicken breasts
• 1 Tbsp olive oil, plus more for brushing grill
• Salt and freshly ground black pepper
• 1 large head romaine lettuce, chopped
• 1 medium cucumber, peeled and chopped
• 1 (10.5 oz) pkg. grape or cherry tomatoes, halved
• 1 cup croutons (optional)
• 1/2 cup sliced black olives
• 1/3 cup chopped red onion, rinsed under water
• Finely shredded parmesan, for serving
• 4 Pepperoncini peppers, for serving (optional)