Easy Lasagna

2 small pkgs. frozen large cheese filled ravioli
1pkg. frozen spinach
1 cup cooked ground beef (optional)
1 Jar spaghetti Sauce
Cheese

In baking dish, layer spaghetti sauce, ravioli, spinach, beef and cheese until baking dish is full. Then layer with grated cheese. Bake uncovered in oven at 350 degrees until bubbly.