1 jar (24 ounces) pasta sauce
1 package (25 ounces) frozen meat or cheese ravioli
1-1/2 cups (6 ounces) shredded part-skim mozzarella cheese
3 cups fresh baby spinach
Preheat oven to 350°. In a small saucepan, heat sauce 5-7 minutes over medium heat or just until simmering, stirring occasionally.
Spread 1/2 cup sauce into a greased 11×7-in. baking dish. Layer with half of the ravioli, 1-1/2 cups spinach, 1/2 cup cheese and half of the remaining sauce; repeat layers. Sprinkle with remaining cheese.
Bake, uncovered, 45-50 minutes or until edges are bubbly and cheese is melted. Let stand 5 minutes before serving.