On a lightly floured surface, unroll dough at seam. Pat dough into a 14-in. x 12-in. rectangle. Sprinkle mozzarella cheese over dough to within 1/2 in. 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.
Bake at 375° for 20-25 minutes or until golden brown. Cool on a wire rack for 5 minutes. Cut with a serrated knife.