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Preheat oven to 350F
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Cut the sandwich sheet in half through the middle to create two "slices" of the sandwich sheet.
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Place the bottom half of the sandwich sheet in the casserole dish.
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Spread the spaghetti sauce over the bread layer and sprinkle with 1 teaspoon of the Italian seasoning.
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Make an even layer of the salami all over the sauce layer. Then repeat with prosciutto and pepperoni.
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Top with the mozzarella slices and then place the top half of the sandwich "sheet" on top.
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Place the butter in a saucepan over medium heat and melt approximately 2 minutes. Stir in your remaining seasoning and salad dressing (if using).
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Pour the butter mixture evenly over the sandwiches and cover the casserole dish with tinfoil.
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Bake for 20-30 minutes until the butter has completely absorbed into the rolls.
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Cut and serve.