Lasagna in a Bun

Directions

1. In a skillet, cook beef and onion over medium heat until meat is no longer pink; drain. Add tomato sauce, 1/2 teaspoon Italian seasoning and salt. Cook for 5 minutes or until heated through. Meanwhile, combine 1/2 cup mozzarella, ricotta, egg white, Parmesan and remaining Italian seasoning; mix well.
2. Cut a thin slice off the top of each bun. Carefully hollow out bun bottoms, leaving a 1/4-in. shell. (Discard removed bread or save for another use.) Spoon meat mixture into buns; top with the cheese mixture. Sprinkle with remaining mozzarella. Replace bun tops. Wrap each in heavy-duty foil. Place on a baking sheet.
3. Bake at 400° for 25 minutes or until heated through.