To assemble the salad, place romaine and radicchio in a large bowl; top with mozzarella, salami, chickpeas, olives, bell pepper, cucumber, pepperoncini, tomatoes and red onion.
Pour the dressing on top of the salad and gently toss to combine. Top with Parmesan.
For the dressing
In a medium bowl, whisk together olive oil, vinegar, Dijon, garlic, oregano and red pepper flakes; season with salt and pepper, to taste.
Notes
Prep ahead of time. Save time by making the dressing up to 1 week in advance, and prepping and dicing the vegetables 1-2 days prior and storing them in airtight containers in the fridge.
Dry the greens thoroughly. Wash and dry the greens thoroughly using a salad spinner to avoid the dressing from sliding off or causing the greens to go limp and soggy very quickly.
Cut in uniform size. Cut all of the salad ingredients in similar size pieces for a consistent bite.
Use extra virgin olive oil. High quality extra virgin olive oil is ideal for salad dressings for maximum flavor.
Add some crunch. Add some pine nuts, sunflower seeds or slivered almonds for even more crunch.
Toss the dressing just before serving. This will avoid a soggy salad and allow for maximum, crisp freshness.
Make it vegetarian. Skip the salami altogether to make it vegetarian-friendly, adding extra chickpeas and bell peppers.