On a lightly floured surface, pat dough into a 14 x 12 inch rectangle. Sprinkle mozzarella cheese over dough to within 1/2 inch of edges. Top with a single layer of ham. Roll up tightly from a short side; pinch seam to seal. Place seam side down on an ungreased baking sheet. Brush top of loaf with butter; sprinkle with Parmesan cheese.
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