Step 1

Arrange a rack in the middle of the oven and heat to 400°F. Lightly coat a 3-quart casserole dish or a 9x13-inch baking dish with olive oil; set aside.

Step 2

Bring a large pot of salted water to a boil. Add the ravioli and cook until it's quite al dente, about 2 minutes, or 2 minutes less than suggested on package instructions, as it will keep cooking when baked. Drain and set aside.

Step 3

Heat the oil in a sauté pan large enough to fit the ravioli over medium heat until shimmering. Add the mushrooms, season with salt and pepper, and sauté until softened and lightly browned, 4 to 5 minutes. Stir in the garlic and cook until fragrant, about 1 minute. Add the marinara sauce and stir to combine. Remove from the heat and stir in the cooked ravioli.

Step 4

Pour half of the ravioli mixture in the prepared baking dish and spread into an even layer. Cover with half of the sliced mozzarella. Pour the remaining ravioli mixture over the mozzarella. Top with the remaining mozzarella and Parmesan. Bake until the top is lightly golden and the cheese is bubbling, 20 to 25 minutes. Let cool for about 10 minutes before serving.