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Defrost dough according to package instructions. Cook beef, onions, peppers, mushrooms (you can add other ingredients according to your taste, such as pepperoni, etc.) Drain very well. Add small amount of spaghetti sauce (meat should not be too moist). Spread defrosted dough to edges of greased 10x15 inch cookie sheet. Layer meat mixture, tiny pieces of tomatoes, the cheese to within 2 inches of both ends of dough. Roll one side over mixture, bring other side over and secure with toothpicks. Pinch edges to close. Beat egg whites sprinkled with Parmesan cheese and brush on top of both loaves. Bake at 375 degrees for 1/2 hour. Cool, cut in pieces. Wrap in aluminum foil and freeze.
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