
Heat the oven to 400°F.
Brown the sausage (casings removed) with the garlic in a skillet over medium-high heat for 7 minutes, then stir in the marinara and spinach until wilted.
Spread a thin layer of sauce in a 9x13 dish, then layer half the frozen ravioli (no need to boil), half the meat sauce, and 1 cup mozzarella; repeat.
Sprinkle with parmesan, cover with foil, and bake 20 minutes; uncover and bake 8 to 10 more until bubbly.
Rest 5 minutes before cutting so it holds together like lasagna.
Photo: DinnerDrop