Florentine Lasagna Roll-Ups

Put a pot of salted water on to boil. Preheat oven to 425°F. Coat a 9-by-13-inch baking dish with cooking spray.

Cook half the lasagna noodles in boiling water until tender, about 8 minutes. With tongs or a slotted spoon, transfer the noodles to a large bowl of cold water. Repeat with the remaining noodles. Drain and arrange the noodles in a single layer on clean kitchen towels. Cover with plastic wrap to keep from drying out. Set aside.

Heat oil in a large saucepan over medium heat. Add onion and garlic and cook, stirring, until softened, about 5 minutes. Set aside 1/4 cup of the onion mixture. Add flour to the onion mixture remaining in saucepan and cook, stirring constantly, for 1 minute. Gradually whisk in milk and return to a simmer; cook, whisking, until thickened to the consistency of heavy cream, 3 to 4 minutes. Remove from heat and season with salt and pepper. Spoon 1/2 cup of the sauce into bottom of the prepared baking dish. Set aside.

Process cottage cheese in a food processor until smooth. Add the reserved 1/4 cup onion mixture, spinach and mozzarella; pulse until finely chopped. Season with salt, pepper and nutmeg. Add egg and pulse until blended.

Spread about 3 tablespoons spinach mixture over 1 noodle. Roll up firmly and place seam-down in the prepared pan. Repeat with the remaining noodles and spinach mixture. Spoon the remaining sauce evenly over roll-ups and sprinkle with Parmesan.

Bake roll-ups, uncovered, until bubbling and golden, 25 to 30 minutes. Cool for 5 minutes before serving.