Prepare the meats. Slice the thick cut meats and cheese into small bite sized pieces and place to the side.
Assemble the salad. Place the salad mix in a large bowl. Add the red onion, tomatoes, and pepperoncini. Next, add the meats and cheese on top of the salad.
Make the dressing. In a small jar, combine the olive oil, vinegar, Italian seasoning, and salt and pepper. Cover the jar with a lid and shake well. Drizzle the dressing over the whole salad or into idividual bowls. Mangia!