How to Make It
Combine oil, mayonnaise, vinegar, lemon juice, sugar, salt, pepper, Italian seasoning, garlic, and Parmesan in a food processor, and process until thoroughly combined.
Combine salad mix, olives, pepperoncini, onion, tomatoes, and croutons in a large bowl. Drizzle salad with dressing; toss to coat. Let stand 5 minutes before serving.