Mix cottage cheese, egg, spinach, and oregano.
Spray 9×13 pan with cooking spray.
Layer 1/3 of the pasta sauce, then lasagna noodles, 1/3 of spinach mixture, and 1/3 of the mozzarella cheese.
Repeat this 2 times.
You can also sprinkle the top with some Parmesan cheese.
Make sure the noodles are covered so they won’t get hard.
Tightly cover with aluminum foil and bake for 1 1/4 hours at 350 degrees.
The last few minutes you can uncover and let the cheese on top get nice and bubbly.
Let it cool and set for at least 10 minutes before serving.