Lasagna In A Bun - cooking recipe

Ingredients

6 French-style rolls
1/2 lb. ground round
1/2 c. diced onion
1 (8 oz.) can no-salt-added tomato sauce
1 tsp. Italian seasoning
1/2 tsp. salt
1 egg white
3/4 c. shredded Mozzarella cheese, divided
1/3 c. Ricotta cheese
3 Tbsp. grated Parmesan cheese
1/2 tsp. Italian seasoning

Preparation

Cut thin slices off tops of rolls. Hollow out centers, leaving 1/2-inch thick shells; set aside.