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Prepare ciabatta rolls with butter and garlic salt, to taste.
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Combine cooked gnocchi and marinara sauce; divide evenly among 4 rolls.
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Top gnocchi with sliced provolone cheese and 1 Tbsp. Parmesan cheese.
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Cook open face at 375 degrees for 10-15 minutes or until cheese and butter are melted and bread is toasted.
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*Warning: this sandwich is messy, but so worth it!