Preheat the Oven:
Preheat your oven to 375°F (190°C).

Make the Cheese Mixture:
In a mixing bowl, combine ricotta cheese, ½ cup mozzarella, ½ cup Parmesan, the beaten egg, chopped parsley, dried basil, garlic powder, salt, and pepper. Mix everything together until well combined.

Prepare the Baking Dish:
Spread a thin layer of marinara sauce on the bottom of a 9×13-inch baking dish.

Assemble the Roll-Ups:
Lay the cooked lasagna noodles flat on a clean surface. Spread about 2 tablespoons of the cheese mixture onto each noodle and top with 2 tablespoons of cooked sausage.

Roll and Arrange:
Carefully roll up each noodle and place it seam-side down in the prepared baking dish. Arrange the roll-ups in a single layer.

Add Sauce and Cheese:
Pour the remaining marinara sauce over the roll-ups. Top with the remaining mozzarella and Parmesan cheese.

Bake:
Cover with aluminum foil and bake for 25 minutes. Remove the foil and bake for another 10-15 minutes, until the cheese is bubbly and golden.

Serve:
Let the roll-ups cool for a few minutes before serving. Garnish with extra parsley if desired.