1. Preheat oven to 400ºF. Mist a 2-quart baking dish with cooking spray.
2. Bring a large pot of salted water to a boil. Cook tortellini according to package label instructions (8 to 10 minutes for fresh or 12 to 15 minutes for frozen). Drain thoroughly. Spread tortellini evenly over bottom of baking dish.
3. Combine marinara and ricotta in a large microwave-safe measuring cup. Microwave on high until hot, about 2 minutes. Pour sauce over tortellini. Sprinkle mozzarella and Parmesan over pasta. Bake until heated through and Parmesan is bubbling and golden, approximately 15 minutes. Sprinkle with basil and serve.