Make the dressing: Add the olive oil, vegan mayo, vinegar, nutritional yeast, sugar, Italian seasoning, garlic powder, onion powder, salt, and pepper to a jar. Shake well (or whisk in a bowl) until fully combined.
Assemble: To a large salad bowl add the romaine, iceberg, tomatoes, red onion, black olives, and pepperoncini.
Dress and serve: Toss with the dressing right before serving. Top with vegan croutons and vegan parmesan and serve.
