Preheat your oven to 350º, and oil your baking pan.
Season the thawed spinach with salt and pepper to taste.
To the cottage cheese, add a tablespoon or so of Italian herb seasoning, and more salt and pepper to taste.
Place a layer of lasagna noodles in the bottom of your oiled baking pan.
Distribute about half of the seasoned spinach on top of the noodles.
Spread about half of the seasoned cottage cheese on top of the spinach and noodles.
Add another layer of noodles, spinach, and cottage cheese to the dish.
Add one final layer of noodles on top, then add a layer of fresh tomato slices on top of the noodles.
Pour the two cups of marinara sauce evenly over the top of the lasagna, then sprinkle the mozzarella evenly on top of the sauce.
Cover the lasagna with tin foil, and bake in the oven for 50 minutes.
Carefully remove the foil, and let it bake uncovered for an additional 10 minutes or so to brown the cheese.