Preheat the oven to 350°F. Cook the ground beef until no longer pink. Drain well, and then pat with paper towels to absorb further grease. Combine the ground beef and the spaghetti sauce in a bowl; set aside.
Blend the cottage cheese, beaten eggs, salt, pepper, parsley flakes, and parmesan cheese in another bowl; set aside.
In a deep baking dish (approx. 10x7x3), lightly cover the bottom with the meat sauce (about 1 cup). Place 3-4 lasagna noodles over the sauce, depending on how many will fit. Spread half of the cheese mixture on the noodles and cover with half of the sliced mozzarella cheese, spaced evenly across the cheese mixture. Spread half of the meat sauce over the sliced cheese. Repeat layers, ending with the meat sauce.
Bake in preheated oven for at least 1-1/4 hours, or until the lasagna is bubbling all over. Let stand 10 minutes before serving.