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 ⓘ