Wash and dry the mixed salad greens thoroughly. You can use a salad spinner or gently pat them dry with paper towels. In a large salad bowl, combine the mixed salad greens, cherry tomatoes, cucumber slices, red onion slices, and shredded carrots. Toss the ingredients together gently to evenly distribute them in the bowl. If using optional toppings, sprinkle them over the salad. Just before serving, drizzle the desired amount of salad dressing over the salad. Start with a small amount and add more if needed. Toss the salad again to coat the ingredients with the dressing. Serve the house salad immediately as a side dish or as a refreshing starter to your meal.