In a mixing bowl, combine olive oil, white wine vinegar, Parmesan cheese, mayonnaise, lemon juice, garlic salt, and Italian seasoning. Whisk until well blended and smooth.

Wash and chop tomatoes. Slice red onion into rings. Chop black olives.

Add American salad blend, pepperoncini, chopped tomatoes, sliced red onion, black olives, and croutons to a large mixing bowl. Toss gently.

Drizzle dressing over salad mixture and toss gently to coat all ingredients.

Transfer the dressed salad to a serving bowl or serve directly from the mixing bowl.