Make the dressing: Add all of the ingredients listed above to a medium bowl and whisk until smooth. Taste and adjust seasonings as needed and set aside.
Make the salad: Chop the chicken, salami, pepperoni, onion, pepperoncini, and tomatoes, and place everything in a large bowl.
Toss well with the dressing.
Store in a covered container in the fridge for up to one week or portion into four smaller containers.
