Combine ground chuck,Italian sausage,egg,bread crumbs,onions,1/3 cup of tomato sauce,salt,oregano,mushrooms,and pepper.
Mix well and shape into a flat rectangle about 10 x 12 on waxed paper.
Sprinkle mozzarella cheese over meat mixture.
Roll up like a jelly roll and press ends to seal.
Place in loaf pan.
Bake at 350 for 1 hr.
Pour on remaining tomato sauce and bake an additional 15 minutes.
Add more mozzarella cheese, if desired during the last 15 minutes of baking.
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