Preheat your oven to 400 F. Spray a traditional sized muffin pan with olive oil.
Stack in the slots, first your zucchini, then slather on about 1 teaspoon sauce, then a salami slice (if using) and then top with cheese. I made three layers of zucchini and spread sauce on each and mozzarella on top of that. You can sneak in salami or sliced turkey in between. Don't worry if the stack looks to high - they shrink when cooked. Sprinkle tops with oregano and chili pepper flakes.
Bake for 20-22 minutes or until they look golden brown on top. Remove almost immediately from the pan using a fork to lift them up from the bottom.