Preheat oven to 350℉.
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.
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.
