Cook pasta according to package directions; drain. Cool in single layer on foil. Meanwhile; in large bowl; stir together spinach; 1-1/2 c mozzarella cheese; cottage cheese; egg; garlic powder and pepper. Spoon about 3 T filling into each pasta tube. Heat oven to 375°F. In 13x9-inch baking dish; spread 1/2 c spaghetti sauce. Arrange filled pasta tubes in single layer in dish. Pour remaining sauce over top; cover with foil. Bake 40 minutes. Remove foil; sprinkle with remaining 1/2 c mozzarella cheese. Bake 5 to 10 minutes or until cheese is melted and sauce is hot and bubbly. 7 servings 2 manicotti each.