Preheat your oven to 350°F (175°C) and bring a medium saucepan of water to a boil over high heat.

Add a pinch of salt to the boiling water, then add the tortellini. Cook until the tortellini floats to the top, about 6-8 minutes (longer if cooking from frozen).

Drain the cooked tortellini and let it sit in a strainer for 1-2 minutes to ensure all water is drained.

In an 8x8 or 11x7 baking pan, combine the tortellini with the marinara sauce.

Sprinkle the freshly grated mozzarella cheese over the top of the tortellini.

Bake in the preheated oven for 20-25 minutes, or until the cheese is bubbling on top.

Switch the oven to broil and broil for an additional 5-6 minutes, or until the cheese is browned.

Serve the tortellini bake immediately, accompanied by a side salad.