Heat oven to 350°F. In large bowl, mix ground beef, sausage, egg, 1/2 cup of the pizza sauce, the bread crumbs and pepper.
On foil, pat mixture to12x8-inch rectangle. Sprinkle evenly with cheese; gently press into meat. Top with spinach. Starting at short end, roll up tightly, using foil to start roll and tucking in spinach leaves; seal ends. Place seam side down in ungreased 12x8-inch (2 quart) glass baking dish.
Bake 1 hour. Spread remaining pizza sauce over top. Bake 15 minutes longer or until thermometer inserted in meat loaf reads 160°F. Let stand 5 to 10 minutes before serving.