Meat and Cheese Roll

1-1/2 lbs. lean ground beef
1 egg
3/4 cup bread crumbs (italian style)
1/2 cup finely chopped onion
1 can (15 oz) tomato sauce
1 tsp. salt
1/2 tsp. pepper
2 cups shredded mozzarella cheese

Preheat oven to 350. Combine beef, egg, bread crumbs, onion, 1/3 cup tomato sauce, salt and pepper. Mix well and shape into a flat rectangle about 10x12 on a piece of wax paper. Sprinkle 1-1/2 cups shredded cheese evenly over meat mixture. Starting with shortest end, roll up jelly roll fashion and press ends of roll to seal. Bake in a shallow baking pan for 1 hour at 350. Drain off excess fat. Pour remaining sauce over roll. Garnish with remaining 1/2 cup shredded cheese and green pepper rings. Bake an additional 5 minutes, or just until cheese starts to melt.