01 -
Cook jumbo pasta shells in boiling salted water according to package instructions until al dente. Drain and set aside.
02 -
In a large bowl, combine ricotta cheese, grated Parmesan, chopped cooked mushrooms, beaten egg, garlic powder, salt, and black pepper. Mix until well incorporated.
03 -
Preheat oven to 190°C (375°F). Spread 1 cup of Alfredo sauce evenly on the bottom of a baking dish.
04 -
Generously stuff each pasta shell with mushroom filling and place them, open side up, into the prepared baking dish.
05 -
Pour remaining 1 cup Alfredo sauce over the stuffed shells. Sprinkle evenly with shredded mozzarella cheese.
06 -
Cover the dish tightly with aluminum foil and bake for 25 minutes. Remove foil and continue baking for an additional 10 minutes, or until cheese is bubbling and golden.