Preheat oven to 350ºF. Line baking tray with parchment paper. Butter the bottom slice of each sub bun bread and lay butter side down on parchment paper. Then place one slice of harvati cheese, 2 slices of ham, and 3 slices of cotto salami. Put top part of sub bun on top. Spread butter on top on the sub bun. Garnish with poppy seed, minced onion, parsley, garlic powder. Repeat this till all 6 sandwiches are made. Bake for 10 minutes or until cheese is melted. Allow to cool before serving.