Squeeze out as much water as you can from the defrosted spinach. In a bowl, combine spinach, cottage cheese, eggs, garlic, and mozzarella cheese. Mix well.
Assemble the lasagna: Place about ½ cup of marinara sauce in a 9- x 13-inch pan. Top with 4 lasagna pieces. You might need to break some of the pasta corners a bit, as shown in the photos. Spread a layer of the spinach/cheese mixture.
Repeat with 2 more layers lasagna, sauce, and spinach/cheese mixture. End with a layer of pasta, then top with marinara sauce and sprinkle with muenster cheese.
Pour about ¾ cup water, a little into each corner of the pan.
Spray a piece of heavy duty foil with cooking spray. Cover the pan, greased side down.
Bake for 1 hour and 15 minutes. Let stand for 20 minutes before slicing.
Recipe by Between Carpools at https://betweencarpools.com/the-9x13-life-easy-lasagna-that-tastes-so-gourmet/