Meat Loaf:

1 to 1 1/2 lb. ground beef/turkey
1 to 1 1/2 c. breadcrumbs
1 small onion, chopped
1/2 c. tomato sauce
1 egg, beaten
1/2 tsp. garlic powder
3/4 tsp. each salt and pepper
1/2 tsp. crushed red pepper flakes

Filling:

1 pkg. frozen spinach, defrosted and drained
1 c. Mozzarella
1/2 c. Parmesan

Heat oven to 350°F. Spray bread pan with Pam. Combine meat loaf ingredients thoroughly in large bowl.

Mix filling ingredients in a medium bowl.

Press meat mixture into an 8 x 14-inch rectangle on a large sheet of waxed paper. Spread filling over meat, leaving a 3/4-inch border of meat around edges. Roll, beginning from 1 of the shorter ends, in a jelly roll fashion. Seal ends with meat over filling. Place seam side down on pan.

Bake 60 to 75 minutes until firm.