Prepare the Vegetables. Start by washing and drying your vegetables. Chop the Romaine lettuce, cucumber, bell peppers, and red onion into bite-sized pieces. Slice the tomatoes in halves or quarters, depending on their size, and set them aside.
Prepare the Meats and Cheese. For the meats, slice your salami or pepperoni into small pieces. You can also use diced ham or prosciutto for a different flavor. Next, chop the mozzarella into cubes or tear it into smaller chunks.
Make the Dressing. In a small bowl, whisk together the olive oil, red wine vinegar, Dijon mustard, garlic powder, Italian seasoning, salt, and pepper. Taste and adjust the seasoning, adding more vinegar for tang or salt for flavor. Once well combined, set it aside so the flavors can meld together.
Assemble the Salad. In a large bowl, combine the prepared Romaine lettuce, cucumbers, bell peppers, tomatoes, red onion, salami, mozzarella, and black olives. Pour the dressing over the top and toss everything together until the salad is well coated.
Serve and Enjoy! Transfer the salad to a large serving bowl or individual plates. Garnish with extra mozzarella or olives for an added touch of flavor.