Beef Roll Mozzarella

Ingredients

• 1 1/2 lb. lean ground beef
• 1 tsp. salt
• 1/4 tsp. pepper
• 1 tsp. onion flakes
• 1 egg, lightly beaten
• 1/2 c. packaged bread crumbs
• 1 (4 oz.) can mushroom stems and pieces
• 1 1/2 c. shredded Mozzarella cheese
• 1 (15 oz.) can tomato sauce with tomato bits
• 1/4 c. brown sugar
• 1/2 tsp. dry mustard
• 1/2 tsp. Worcestershire sauce
• 1/4 tsp. seasoned salt