Preheat the oven to 375 degrees F with the rack in the middle. Spray a 13" X 9" casserole dish with cooking spray.
Thaw spinach & press out any water. In a bowl combine the spinach, ricotta cheese, cottage cheese & parsley. Season with some salt & pepper. Set aside.
Assemble the lasagna: Pour 1/3 of the sauce into the pan. Layer on 5 noodles. Top with 1/3 of the cheese & spinach mixture and 6 oz of mozzarella cheese. Repeat this 2 more times: sauce, noodles, filling, and cheese. You should have a total of 3 layers of sauce, noodles, filling, and cheese.
Cover the lasagna in foil & bake for 20 minutes. Uncover, add a garnish of fresh basil on top & broil on low for 5 minutes. Cheese should be browned & bubbly.
Serve hot. This makes great leftovers too! Just let it cool, then store in an airtight container for about 3 days in the fridge.